Question

What should be added to $64$ to obtain $78$ ?

• A. 14

Answer 1

The correct option is A 14
We need to find a number that when adds to to 64 equals 78.
$\Rightarrow ?+64=78$

To find the unknown number, we need to subtract 64 from 78.

Aligning both the numbers according to their place value (starting from the right) :

Place the like terms of the digits together i.e. digits at ones place will be placed together and digits at tens place are to be placed together.


By subtracting $4$ ones from $8$ ones, we get $4$ ones.


Similarly, by subtracting $6$ tens from $7$ tens, we get $1$ tens.



Thus, the answer is $14$.