Answer :
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.
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.
we have
[tex] (81-16) [/tex]
One way to use mental math is to add [tex] 4 [/tex] to both [tex] 81 [/tex] and [tex] 16 [/tex]
so
[tex] 81+4=85\\ 16+4=20\\ 85-20=65 [/tex]
therefore
[tex] 81-16=65 [/tex]
the answer is
[tex] 65 [/tex]
