Checking Subtraction using Addition

We can check subtraction by adding the difference to the smaller number. Let us see how.

Example:

Checking Subtraction using Addition

Since the sum of difference and smaller number is equal to the larger number, subtraction is correct.


This method also works with sums that need regrouping.


More examples on Check subtraction using addition

Find the difference and check your answers using addition:

1. 82 - 48

Solution:

Let's try to subtract 48 from 82.

T

O

7

12


8

2

-

4

8


3

4

Therefore, the difference is 34.


Now check the subtraction is correct or not.

So, we add add difference (34) and subtrahend (48). If the sum is equal to the minuend (82) then the the subtraction is correct.

T

O

1


3

4

+

4

8


8

2

Therefore, the sum (82) is equal to the minuend (82).

Thus, we can say that the subtraction is correct! 


2. Subtract 24 from 59.

Solution:

Check subtraction using addition

Since the sum of difference (35) and smaller number (24) is equal to the larger number (59), subtraction is correct.


1. Questions and Answers on Checking Subtraction using Addition:

(i) 74 - 59

(ii) 60 - 25 

(iii) 32 - 19

(iv) 91 - 20

(v) 81- 38

(vi) 64 - 27

(vii) 72 - 38

(viii) 96 - 84

(ix) 45 - 31

(x) 81 - 56


Answer:

1. (i) 15

(ii) 35

(iii) 13

(iv) 71

(v) 43

(vi) 37

(vii) 34

(viii) 12

(ix) 14

(x) 25



2nd Grade Math Practice

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