Grade 1 - Number
Standard 1.N.10 - Solve addition equations involving 3 numbers up to 20.
Included Skills: Addition
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.