One great thing about doubling is that there are only 10 numbers you need to be able to double. If you can double those 10 numbers, you can double anything. WooHoo :)

So let us get started doubling...

Step 1: Double the first digit, so 2 doubled is 4

Step 2: Double the next digit, so 3 doubled is 6

Great, our answer is 46

Let's try another one, how about doubling 324

Step 1: Double the first digit, so 3 doubled is 6

Step 2: Double the next digit(s), so 2 doubled is 4 and 4 doubled is 8

Great, our answer is 648, easy right?

Now here are some practice problems for you to have fun with.

Now here are some practice problems for you to have fun with.

` 14 32 12 42 20`

130 243 212 732 524

9142 7314 1310 7143 6421

2102 2011 5434 6023 9331