The 'Make A Ten' Strategy is a simple yet effective, easy to remember system for working out multiplication in mental arithmetic circumstance. We will give a brief detailing below (and it will be brief, as it's so easy to do!), using the sum '89 + 24' -

First, you must change one number to a multiple of ten. 89 is the number already closest to a multiple of ten, so we will add 1 to it to make it to 90.

Now you must adjust the other number in the OPPOSITE manner. Because we added 1 to 89, we must SUBTRACT 1 from 24, to make it 23.

Now, it is much easier to work out 90 + 24, than it is to work out 89 + 24.

The answer to both of these sums is 113.

The correct answer is: 113.

First, you must change one number to a multiple of ten. 89 is the number already closest to a multiple of ten, so we will add 1 to it to make it to 90.

Now you must adjust the other number in the OPPOSITE manner. Because we added 1 to 89, we must SUBTRACT 1 from 24, to make it 23.

Now, it is much easier to work out 90 + 24, than it is to work out 89 + 24.

The answer to both of these sums is 113.

The correct answer is: 113.