Lesson

Can you solve this multiplication by doubling ?

Double 9.

Worked Solution

Idea summary

To double a number, we multiply the number by 2.

Let's look at the relationship between the 2, 4, and 8 times tables.

Find 6\times 8.

Worked Solution

Idea summary

\times \,2 means "double the number."

\times \,4 means "double the number, then double the answer."

\times \,8 means "double the number, double the answer, then double the answer again."