Question

Describe two different ways that you could find the product (8 x 997) using mental math. Find the product and explain why your methods work.

My answer (half completed): One method is to round up 997 to 1000, then multiply by 8 and subtract by 24 (8 x 3) which will give you 7976.

Answer 1

you can round 8 to 10, then multiply by 997 and subtract 2 x 997, which will also give you 7976