Solving Multiplication Problems using Doubling and Halving as a Strategy! Shanay and Samantha.

Problem:

There are 5 donuts in a pack. In the the box are 18 packs. How many donuts are there altogether?

Step 1: Read the problem

Step 2: Put it in a maths equation: 5 x 18 =

Step 3: Choose strategy - Doubling and Halving

Step 4: Solve it: 

Double the 5 to 10, and halve the 18 to 9

So 10 x 9 = 90 

Learning Tip: Always use doubling and halving when you multiply with 5 and 20. Using this strategy will always ensure you multiply by 10. That is easy.