What should be added to $56$ to obtian $79$ .

23

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Solution

The correct option is A 23
We need to find a number that when added to 56, the sum equals 79.
$? + 56 = 79$
To find the unknown number, we ned to deduct 56 from 79.

Aligning both the numbers according to Place value table,

For subtracting these two numbers we need to place the like terms of both the digits together i.e. digits at ones place will be placed together, digits at tens place will be placed together.

For ones place, $9 - 6 = 3$

For tens place, $7 - 5 = 2$

Thus, the answer is $23$

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