What is triple the difference of eighty-one and twenty-two

Question

Write in Numerical Expression. Triple the difference of eighty-one and twenty-two

Answer 1

First we are looking for the difference (rather than the sum) of eighty-one and twenty-one, so we will subtract the smaller value from the larger.

81-21

Next we want that value tripled. We turn the subtraction expression into a single value by surrounding it w/ a pair of parenthesis:

(81-21)

This single value can now be tripled by multiplying it by a factor of 3:

3*(81-21)

We now have numerical expression that satisfies the description :)