Common Core Math Vocabulary

# Doubles Plus 1 - Definition with Examples

## Let's learn!

**What is doubles plus 1?**

Doubles plus 1 is a strategy used to add two consecutive numbers that is, when they are next to each other.

We simply add the smaller number twice or double it and then, add 1 to it, to get the final result.

Here, for example, consecutive numbers 8 and 9 have been added using the doubles plus one strategy.

Here are more examples of the double plus 1 strategy.

## Let's sing!

*Let’s add consecutive soap bubbles,*

*Adding five and six; there’s no trouble!*

*Just make the smaller number double,*

*Then add 1 to the double of the bubbles.*

## Let's do it!

Have fun with your child by asking them to find the doubles of numbers you say and then use double plus 1 and doubles minus 1 strategies to find the sum of consecutive numbers between 1 and 20.

## Related math vocabulary

The Complete K-5 Math Learning Program Built for Your Child