Skill: Use doubles facts

Explanation and Free Practice Resources

Doubles facts describe additions with equal addends, such as $6+6=12$ , and establish the relationship between a number and twice that number for sums through $10+10=20$ . These facts support efficient reasoning with near doubles, such as finding $6+7$ by adjusting $6+6$ by one, and reinforce the commutative structure of addition; more extensive multiplication or generalized doubling is beyond this scope.

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Detailed Explanation: Use doubles facts

A doubles fact is an addition problem with the same number added twice. For example, $6+6$ is a doubles fact because both addends are $6$ .

To solve a doubles fact, count the first group, then count on the same number more.

Example: Find $8+8$ .

Start with $8$ .
Count on $8$ more: $9,10,11,12,13,14,15,16$ .
So, $8+8=16$ .

You can remember this doubles fact as:

8+8=16

The order does not change the sum, so $8+8$ is also the same as $8+8$ .

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Addition - Whole Number - Doubles

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