WHOLE NUMBERS(POST -3)
GOOD MORNING BOYS!
Let us revise some properties of whole numbers. These properties help us to understand numbers better and make calculations under certain operations very simple!
CLOSURE PROPERTY UNDER ADDITION AND MULTIPLICATION
![](https://image.slidesharecdn.com/l4propertiesofwholenumbersinadditionandmultiplication-161202043706/95/properties-of-whole-numbers-in-addition-and-multiplication-2-638.jpg?cb=1480653527)
ADDITION AND MULTIPLICATION IS COMMUTATIVE FOR WHOLE NUMBERS-
This means you can add numbers in any order, the sum (answer) will be thhe same.
eg. 7+3 =10 4+3+5 =12
3+7=10
You can multiply numbers in any order, the product (answer) will be the same.
eg. 4 x 5=20
5 x 4 =20
ASSOCIATIVE PROPERTY OF ADDITION AND MULTIPLICATION
![](https://www.onlinemathlearning.com/image-files/associative-property.png)
IDENTITY PROPERTY
IDENTITY PROPERTY OF ADDITION
![See the source image](https://www.onlinemath4all.com/images/propertiesofaddandmultiply.png)
![](https://i.ytimg.com/vi/wiOsLCiVUWA/maxresdefault.jpg)
ADDITION USING SUITABLE GROUPING OF NUMBERS
When we have to add three numbers, first add those two numbers which will give you a sum that is a multiple of 10. Then add the third number to the sum.
For eg. 7+4+3
(7+3)+4
10+4 =14
125+ 560 +375
(125 + 375) + 560
500 + 560 =1060
NOW TRY AND SOLVE THESE QUESTIONS:
1.Fill in the balnks
a. ............ x 54 = 54
b. 21 + ............. = ..............
c. 34 x 45 x ......... = 0
d. 16 +20 can also be added as .......... + ............ = 36
e. 7 x 5 can also be multiplied as ............ x ........... = 35
2. Find the sum using suitable grouping
a. 165 + 228 +35
b. 350 + 11 + 150
c. 1125 + 34 + 275
d. 837 + 408 + 363
THIS IS ALL FOR TODAY ! HAVE A GOOD DAY
GOOD MORNING BOYS
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