Grade 1 - Number
Standard 1.N.10 - Practice solving addition sentences to make a specific number up to 10.
Included Skills: Addition, Number Properties
Describe and use mental mathematics strategies including • counting on, counting back • using one more, one less • making 10 • starting from known doubles • using addition to subtract to determine the basic addition and related subtraction facts to 18. (It is intended that students show their understanding of strategies using manipulatives, pictorial representations, and/or patterns when determining sums and differences.) • Use and describe a mental mathematics strategy for determining a sum. • Use and describe a mental mathematics strategy for determining a difference. • Use and describe the related addition facts for a subtraction fact (fact family) (e.g., 6 – 4 = 2 has two related addition facts: 4 + 2 = 6, 2 + 4 = 6). • Use and describe related subtraction facts for an addition fact (fact family) (e.g., 2 + 3 = 5 has two related subtraction facts: 5 – 3 = 2, 5 – 2 = 3).