This document describes a doubling and halving strategy for multiplying numbers. It explains that to multiply numbers like 4x5, you first half one number (4 to 2) and double the other (5 to 10). Then you calculate the result of the doubled number times the halved number to get the answer. It provides example multiplication problems to try using this strategy and credits the creators of the document.

1. Doubling and halving MULTIPLYING USING Doubling and halving is a mathematic strategy to times and add.

8. BYEEEEEE!!!