Question

Tell how to find 81-16 using mental math

Answer 1

Mental math means calculating the given numbers without using anything that can help you solve the problem like paper and pen, calculator, etc.
Now let’s have 81-16
=> 81 -16
=> 65

Now, let’s check if our answer is correct by adding the answer or the difference by the subtrahend.
By the way in subtraction
81 => minuend
16 => subtrahend
65 => difference

=> 65 + 16
=> 81

Our answer is correct. Hope this help.

Answer 2

we have

`(81-16)`

One way to use mental math is to add
`4` to both
`81` and
`16`

so

`81+4=85\\ 16+4=20\\ 85-20=65`

therefore

`81-16=65`

the answer is

`65`