Common Core Math Vocabulary

Doubles Plus 1 - Definition with Examples

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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. 

Doubles plus one addition strategy consecutive numbers

Here are more examples of the double plus 1 strategy.

Doubles plus one addition strategy consecutive numbers real life examples

   Fun Facts

  • Doubles plus 1 and doubles minus 1 are also called near doubles strategies. 
 

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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 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 Related math vocabulary

 

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