Can you solve this multiplication by doubling ?
Double 9.
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.
\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."
Recall multiplication facts up to 10 × 10 and related division facts