Recall Doubles 1+1 through 5+5

A double is when we add a number to itself. Let's try four plus four!

Here are four stars on this side.

And four more stars on this side — the same amount.

Count them all: one, two, three, four, five, six, seven, eight!

So four plus four equals eight.

Here are all the doubles from one plus one up to five plus five.

See four plus four right there — eight, just like we counted.

Notice the answers: two, four, six, eight, ten — every double is an even number!

Practice these five doubles until you just know them. Fast doubles make adding easy!