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Grade 1 - Number

Standard 1.N.10 - Solve addition equations involving 3 numbers up to 20.

Included Skills:

Describe and use mental mathematics strategies for basic addition facts and related subtraction facts to 18.
Use and describe a mental mathematics strategy for determining a given sum.
Use and describe a mental mathematics strategy for determining a given difference.
Use and describe mental mathematics strategies, such as:
- counting on and counting back.
- making 10.
- using doubles.
- thinking addition for subtraction.
Refine mental mathematics strategies to increase their efficiency.
Write the related subtraction fact for a given addition fact.
Write the related addition fact for a given subtraction fact.
Demonstrate understanding and application of strategies for addition facts up to and including 9 + 9 and related subtraction facts.
Demonstrate recall/memorization of addition facts to a sum of 5 and related subtraction facts.

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