Ready to talk about NUMBERS in maths?
SHOW all that you have, blare to the world what you Know &
Also what you want to know, but have yet to know about place value in Numbers to 1 000 000!!!All yours now. . . Start writing because it is Share-&-Tell!
FIGURE 1 FIGURE 2 FIGURE 3
FIGURE 4
755 682,756 285,755 862,756 258,755 826.
ReplyDeleteThese are the numbers you can get with the numbers 2,5,5,6,7,8 and the numbers can be rounded off to 756 000
8642+9328=9000+9000
ReplyDelete=18 000
kim->17 970=18 000
kavita ->1897=2000
kim's answer is more reasonable as it is closer to 18 000 when rounded off.
estatimation must be resonable and mut be rounded off to the nearest number...
ReplyDeletekaiqi:
ReplyDeleteQns:What is 999 999 when rounded off to the nearest hundred-thousand?
Ans:1 000 000
960 000 980 000 1 000 000
|----|----|----|----|----*|
950 000 970 000 990 000
999 999=*
1 000 000 is a very resonable estimation.
→YeeHang←
ReplyDeleteToday, we learn about Order Of Operation. We must start from the left to right. Example:100x2-50+20=200-50+20=150+20=170
The biggest of all is brackets ( )
The second is multiply and divide X /
The smallest is plus and minus + -
THE END OF PRESENTING,THANK YOU~
oder of orperations must start from left to right.
ReplyDeleteOrder of Operations
ReplyDeleteYou should always always multiply/divide first. You should add/subtract later. We should go from left to right but not from right to left.
Yan Naing Lin
Order of operations
ReplyDeleteWe must always start from left to right.For example:19+6-9+9 so we start with 19+6 and we continue.
other than from left to right we must also start with brackets.For example(19+1)x3 so we have to do 19+1 first
all about order of operations we must always multyply or divide first as they are the KINGS OF KINGS! we must add or subtract later as they are just princes. MUST GO FROM LEFT TO RIGHT. NOT RIGHT TO LEFT.
ReplyDeleteOrder of operations
ReplyDeletenow back to where we left off:we learned about brackets and how they should come first.
now we learn about (+,-,x,/)
after brackets we have to do x and / after ()
for example:(56+1)x2+9 so we do x2 after (56+1)
estimation of divition:
ReplyDelete2443/5 is approximetly = ?
/ \
2400 2500
2443 2500
-2400-2443
____ ____
0043 0057
2400 has a smaller difference than 2500,so 2400 is abetter estimate for 2443.
The answer for the question above is 480.
-By Edwin-
ReplyDeleteQ:What is the answer for 9+6x5?
Ans:39
Soultion:We should multiple 6x5 then plus 9 because if there is any multiple(x)or divide sign,we must multiple or divide first.But if there is any ()sign,we must do it first brfore doing multiple or divide first.Bye!
by chelsea
ReplyDeleteQns:6+4x2
solution:It is because we should work from left to right, we should do times and divide first before doing plus and minus even we should work from left to right, as times and divide is so called 'king and queen', so we must do them first but not plus and minus as they are called 'normal' and normal means that it is not as important as the'king and queen' but it is still important.He did their sums wrongly as he did the plus first before the times and got the wrong answer.
The reason (multiplication & division) and (add & subtract) are grouped is when those operations are next to each other you do the math from left to right. You do not necessarily do addition first if it is written next to subtraction.
ReplyDeleteExample: 8 - 6 + 2
2 + 2 Subtraction is first !
4
3 + 4 x 5 = 3 + 20 = 23
Note: 3 + 4 x 5 = 7 x 5 = 35 is wrong answer.
Note: 3 + 4 x 5 = 4 x 5 + 3 = 20 + 3 =23 is the correct answer.
poles and spaces:
ReplyDeleteQ:Mr Tan puts up poles from one end of a road to the other at equal distances apart.there are 27 wooden poles.The with of each pole is 10cm.The distance between 2 poles is 30m.Find the length of the road. 100cm=1m
A: |______|
1pole + 1pole +
1space=30m+10cm+10cm=30m 20cm
|_____|_____|
3poles + 2spaces
=30m+30m+10cm+10cm+10cm=60m 30cm
27 poles - 1 = 26 Spaces
26 spaces x 30m =780m
27 poles x 10 = 270cm = 2m 70cm
780m + 2m 70cm = 782.7m
[order off operations]
ReplyDelete1.Work from left to right
2.Work with the brackets first
3.Work with MULTIPLY or DIVIDE
4.Work with + or -
Edmund Foo
ReplyDelete-----------------------------------------------
When we do order of operations,we need to do brackets first,then times or divide, then we add or subtract.
about order of operations...
ReplyDeletewe must always do the working in the brackets first. for example. (15x4)-20 divided by 2=?
we must do 15x4 first. 15x4=60 then we divide 20 by 2=10.
Then take 60-10=50
p.s it may be wrong :)
Orders of Operation
ReplyDelete74x2+5-2
= (74x2)+5-2
= 148+5
= 153
= 153-2
= 151
Explanation: We should start from left to right. We multiply first as x is bigger than + and -. So we put bracket on 74x2 because we had to do it first. After multipying we get 148 and we + 5 then we get 153 and we - 2 from 153 and get the answer 151.
Done by: Yan Naing Lin and Tan Jing Heng from 5/1
from:Yeo Cin Dee
ReplyDeleteOrder of operations
We must always work from left to right.We must use divide and times first because they are the kings.So,we must do divide and times first before using addition and subtration.Example:
12+6x2-6=
6x2=12
12+12=24
24-6=18
This is the correct method.
Wrong method:
12+6x2-6=
12+6=18
18x2=36
36-6=30
ok,i'll give you another example of how to do the thingy.
ReplyDelete.................7+9+(9-3)
ok.
first step.
Always do the numbers in the bracket first.
Then do the numbers that are not in the bracket,example:9+3 first,then 7+9.
You must always remember that the brackets are kings of the kings in the order of operations section.
Solution to 1)
ReplyDeletesince there are 27 poles then are 26 spaces
27 x 10cm = 270cm = 2m 70cm (breadth of poles altogether)
Now for the spaces
26 x 30m = 780m
When we add the together we get the length of the road like so
2m 70cm + 780m =782m 70cm
The length of the road is 782m & 70cm
Jessie Zhou:
ReplyDelete4972 rounded off to the nearest hundred is 5000
4700 4800 4900 4972 5000
l-----------l-----------l-------l----l
5000 is a better estimation because it is nearer and closer to 5000 rather than 4900.
Tan Le Jun
ReplyDelete-----------------------------------------------
[Order of Operations]
Q:2X3+5X4
A:26
Soultion:When we do this sums,the first step is to work from left to right.We will do the ()sign first.If there is no()signs and there is any x or divide signs,we must do it first.Then we do the + and -.
15+90+42
ReplyDelete=15+(90+42)
=15+132
=147
In respond to Farrell
ReplyDeleteBy Ummar,Kevin and Farrell
If we do not use the numbers on Farrell's first commet,we can get a lot of numbers.
For example:
755 500,755 001,755 002,...........,757 497,
757 498,757 499
This numbers are nearer to 756 000 when rounded off to the nearest 1000.
412 346
ReplyDeletein words:four hundred and twelve thousand,three hundred and forty-six
Dex Eng
ReplyDelete-----------------------------------------------
when we do order of operations,we must do from left to right.we will do brackets first.second,we must times or divide then lastly we do addition or subtraction.
Qsn : Limeng is 10 years old and his sister is 7 years old. In how many years'time will their total age be 41 years?
ReplyDeletesolution :
.------ 12 years ------. 10,11,12,13,14....,21,22 = Limeng
07,08,09,10,11....,18,19 = Sis 17,18,19,20,21....,40,41 = years' time
Ans : In 12 years' time .
...
..
by chama ~*
100+5x10
ReplyDelete=5x10+100
=150
You have to do the x first
followed by+
Jasmine.T
ReplyDelete10 ones = 1 tens = 10
10 tens = 1 hundreds = 10 0
10 hundreds = 1 thousands = 10 00
10 thousands = 1 ten thousands = 10 000
10 ten thousands = 1 hundred thousands = 10 000 0
10 hundred thousands = 1 millions = 1000 000
a hundred has 10 tens =10 0
ReplyDeletea thousand has 10 hundreds or 100 tens =10 00 or 100 0
a hudred thousand has 10 ten thousands or 100 thousands or 1000 hundreds or 10000 tens =1000 00 =100 000 =1000 00 =1 00000
Order of operation
ReplyDeleteWhen doing a sum... Start with multiplication then division OR division then multiplication... It depends on which one comes first in the sum.. ALWAYS START FROM LEFT TO RIGHT!!!! But if a sum has only plus and minus... you can just do the sum... Without jumping here and there...haha but if there are brackets, you must do the ones in the brackets first!!
The order of orperation(in acending order)
+ and - are kings
x and / are kings of kings
( and ) is parents of kings of kings
5 732 800=five million,seven hundredand thirty-three thousand and eight hundred.
ReplyDeleteIf you estimate, you must put the number that is able to be divided by the number behind.Such as 2576 divid by 3is 2700 divid by 3=900
work on the brackets first
ReplyDeleteThen work on the times and divide
Then work on plus and minus
But always work from left to right
Jasmine.T
ReplyDelete34x2x100=?
34x2x100=34x2x100
=68x100
=6800
Word problem:
ReplyDeleteQ: If Beth feeds her goldfish 14 pellets a day,atin of pellets will last 20 days.If she feeds her gold fish 8 pellets a day instead,how many more days will the same tin of pellets last?
A:20x14=280
280/8=35
35-20=15
Shish Before I forget lets continue with the ORDER OF OPERATIONS
ReplyDeleteWell we know about brackets(())being first and x and / next and starting from left to right.
Well you'll probally think what about + and -?
Let me tell you THEY COME LAST,YES I MEAN IT THEY COME LAST!For example 3+3x(6-5).
Step one:(6-5)=1
Step two:3x1=3
Step three:3-3=0
So the answer is 0
When doing sums,always work
ReplyDeletefrom left to right,also take
note that:
+ and - are kings
x and / are king of kings
(...)are parents of kings
Do the more important things first
by Shirlyn:
ReplyDeleteOrder of Operations
Remember to work from left to right.First,start with multipication and division. Next,you do additions and subtractions.But,you must start with the brackets first.Example:
2x2+(6-2)=
6-2=4
2x2=4
4+4=8
So,the answer to this question is 8.
By HeeUn
ReplyDeleteGerry had a total of pens and pencils at first.He then decided to exchange all his pen for pencils.If he exchanged every pen for 2 pencils,he would have 48 pencils.how many pens and pencils did he have at first?
pen/ pencils/total/pen to pencil/pencil/total/
1: 12 18 30 24 18 42
2: 14 16 30 28 16 44
3: 18 12 30 36 12 48
-------ORDER OF OPERATION-------
ReplyDeleteWHEN U DO BODMAS,U ALWAYS START FROM LEFT TO RIGHT. WHEN U SEE MULTIPICATION OR DIVITION DO IT FIRST.ONE VERY IMPORTANT THING IS WHEN U SEE ( ) , DO IT FIRST. THIS COMES IN FIRST BEFORE U DO MULTIPLICATION OR DIVITION.NEXT THING THAT IS VERY SIMPLE IS U DO THE PLUS AND MINUS LAST.
I WIL GIVE U AN EXAMPLE BELOW:
DIVITION SIMBLE IS %!
12+12X4-(15-1)%2=?
OKAY! NOW LET ME SHOW U STEP BY STEP!
STEP 1=15-1=14
STEP 2=12X4=48
STEP 3=14%2=7
STEP 4=12+48=60
STEP 5=60-7=53
FINAL ANSWER IS 53!
----------------THE END-----------------------
THANKS TO THOSE WHO READ MY COMMENT!
~COMMENT BY:Aaron~
MISS LIM WENT TO THE SUPERMARKET TO BUY SOME FISH.IF SHE BOUGHT 8KG OF FISH,SHE WOULD NEED ANOTHER $12.HOWEVER,IF SHE BOUGHT 5KG OF FISH,SHE WOULD HAVE $15 LEFT.WHAT WAS THE COST OF 1KG OF FISH?
ReplyDeleteANS:8KG-5KG=3KG 3KG=12+27 1KG=27%3=9
THE COST OF 1KG OF FISH IS $9.
Jessie Zhou:
ReplyDeleteEstimate
4593 % 73~
/ \ \
\ \ \
/ \ 4900
5000 4200
5000,4200,4900 is not a good estimate.
4593%73~4550%70=65
4550 is a great estimation and is extremely accurate.
4593%73~
ReplyDelete393 / \307
\ 4900
4200
Estimate:4900%70=70
Weng jiayi:
ReplyDelete2567 isn 2600 when it is estimated.It can be 3000 also.But 2600 is closer and more reasonable.That is a better estimation.
2409 when estimated is
ReplyDeletenot 2500 or 3000 it is
2400 because 2409 is
still closer to 2400
even if a 9 is still
behind
Jasmine.T
ReplyDeleteRemeber easy maths!
Let me teach you what i mean!
6879x10=?
Add a 0 after 6879 to finish the math sentence!
Like this:
6879x10=68790
Easy huh? And do u understand?
Estamation
ReplyDeletewhen there is a 2/3/4 digit no.,e.g
(923,4165,49,6535)
you round it off to a 2/3/4 digit no.e.g.
(156~100,4165~4000,49~50,6535~7000)
Estimation:
ReplyDeleteThe smallest reasonable answer that can be rounded off to 58 000 is 57 500 and the biggest answer is 58 499.57 500 is the smallest because 57 499(the next smallest whole number) will be rounded off to 57 000.58 499 is the biggest because 58 500(the next biggest whole number)is rounded off to 59 000.
estimation is to round off a number to the nearest tens ,hundred,thousands,ten thousand,hundred thousand or millions place.
ReplyDelete=D
Fraction
ReplyDelete3459
/ /
3400 3500
3500 is nearer to 3451
3459 % 400=3600%400=9
Responding to Kai Qi:
ReplyDeleteYour answer is correct but I have a better answer.Example:
6.5 6.7 6.9 7 7.1 7.3
|----|----|----|----|----|
6.6 6.8 7.2 7.4
This numbers all estimate to 7.
Done by Ummar
Weng Jiayi:
ReplyDeleteWhen you want to add fractions together, the two denominators must be same.If one of the denominator is 9,another one is 3,the 3 must times 3 to become 9.The numerator must times 3 as well.
When you want to estimate
ReplyDeletea1 digit number,u do not
round up or round down
Tan Le Jun
ReplyDelete-----------------------------------------------
[Rounding off]
Q:Mrs Lim when to the market to buy things.She bought a fish ,a box of eggs ,a chicken and some vegetable.A fish cost $5.60,a box eggs cost $1.20,a chicken cost $8.00 and the vegetable cost $1.70.Round off the total cost out?
A:$18
S:To work it out,you have to add the cost of everthing and you will get the cost $17.50. you round off the cost $17.50 to $18.to round off ,you see the $0.50,the number 5 you see,is larger than 4,3,2 and 1.so you round it off to $18.
at 2+3 times 4= we do time first.
ReplyDeletewhen their is bracket, we do it first then do times or divide and plus at last.
By:Xandella Tan
ReplyDeleteEstimations:
estimation is all about using a number line to change a number to the nearest possible number.if the number has only two digits,like 67,we have to estimate it to the nearest tens.if we have a three digit number like 589,we have to estimate it to the nearest hundred.
for example,2597.the teacher wants us to change the number 5687 into the nearest thousands. 5687->6000
this is because as we have four digit number, we have to estimate it into the nearest thousands.
karen said...
ReplyDelete(The four operation)
Q:2+8x2=20correct?why?
S:8x2=16
2+6=18
A:not correct.()is the frist then x and/, lastly + and-
3
ReplyDelete-=3 out of four
4
4=four equal total parts
3=three equal parts.
Responding to Ummar:
ReplyDeleteYou did not give the rest of Kai Qi's comment.
The correct nunber line is:
1000000 1100000 1200000 1300000 14000000
*|--------|---------|---------|---------|etc.
------------------By Edwin---------------------
ReplyDelete[Estimation/Rounding Off]
Note:We round off numbers so that we are able to estimate.
Q:What are those numbers when it is rounded off to 8000?
Ans:7500 to 8499
Soultion:Those numbers is rounded off to 8000 because if you draw a number line you can see that those number is nearer to 8000.
Note:8500 is not rounded off to 8000 but 9000
7600 7800 8000 8200 8400 8500
|---|---|---|---|---|---|---|---|---|--|....-|
7500 7700 7900 8100 8300 8499
When we estimate numbers,there must have a higher estimate and a lower estimate.
We have to ask if we don't know how to solve the questions.And we must memorize formula and also learn with understanding the questions
ReplyDeleteyo ppl! sorry to disturb you ms wong. I'm here to say hi to mii old f-uans! Yo 5/1s good work! keep it up! All the best for CA1 !! Byebye ppl
ReplyDelete23 445 in numbers is:
ReplyDeleteTwenty-three thousand,four hundred and fourty-five
ORDER OF OPERATIONS
ReplyDeleteIf there is only + and -,work from left to right.For example,
56+849-87 =56+849=905
=905-87=818
The final answer is 818.
I got this wrong in my CA1. Now I know how to do it. I'll show you how:
ReplyDeleteQ25. Mrs Lee buys some candy for the children in her kindergarten. If she gives each child 12 pieces of candy she will have 81 pieces left over. If she gives each child 15 pieces, she will be short of 87 pieces.
a) How many children are there in the kindergarten?
b) If another 15 children join the kindergarten, what is the maximum number of candy pieces she can give to each child equally?
a)87+81=168
168/3=56
There are 56 children in the kindergarten.
b)56+15=71
56x12+81=753
753/71=10r43
The maximum number of pieces of candy she can give to each child if 15 children join the kindergarten is 10 pieces of candy.