Grade 1 - Number
Standard 1.N.10 - Complete the addition or subtraction sentence by filling in the blank.
Included Skills: Mixed Equations
Describe and use mental mathematics strategies (memorization not intended), such as: • counting on and counting back • making 10 • doubles • using addition to subtract to determine the basic addition facts to 18 and related subtraction facts. • Achievement Indicators (It is not intended that students recall the basic facts but become familiar with strategies to mentally determine sums and differences.) - Use and describe a personal strategy for determining a given sum. - Use and describe a personal strategy for determining a given difference. - Write the related subtraction fact for a given addition fact. - Write the related addition fact for a given subtraction fact.