Use Doubles and Near-Doubles Together to Add: Mixed Practice

Today we'll use a clever trick — doubles! When you know a double, near-doubles get easy too.

Here's our problem: six plus seven. What does it equal?

Look closely at the seven. Seven is just one more than six!

And six plus six is a double we know. Six plus six equals twelve.

See? Six dots, and six more dots — that's twelve dots in all.

Now, since seven is one more than six, we add just one extra dot.

Twelve plus one is thirteen.

So six plus seven equals thirteen!

Use a double you know, then add one more. That's the near-doubles trick!