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practice time 2E

Add the numbers. Check your answer by adding them in the opposite order.

1. 2. 3.

H t O H t O th H t O

8 7 2 1 0 6 3 0 9 0
+ 1 2 7 + 4 0 5 + 6 3 0 7

Addition properties

order of Addition

Let us see what happens when we change the order of the addends while adding.

(a) H t O H t O (b) th H t O th H t O

2 4 3 1 2 5 2 3 5 0 3 0 4 3
+ 1 2 5 + 2 4 3 + 3 0 4 3 + 2 3 5 0
3 6 8 3 6 8 5 3 9 3 5 3 9 3

In both cases, we get the same answer.
This shows that the order of the addends does not change the sum. This is called the

order property of addition.

property of 0

When ‘0’ is added to a number, the sum is equal to the number itself.

Examples: (a) 123 + 0 = 123 (b) 4325 + 0 = 4325 (c) 6739 + 0 = 6739
property of 1

When we add '1' to a number, the sum is the successor of that number.
Examples: (a) 386 + 1 = 387 (b) 2168 + 1 = 2169 (c) 4329 + 1 = 4330

Adding 10, 100 And 1000

Adding 10

When we add '10' to a number, the value of the digit at the tens place increases by 1 and

the ones digit remains the same.

Examples: (a) 442 + 10 = 452 (b) 6954 + 10 = 6964 (c) 5302 + 10 = 5312

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