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In first grade, students deepen their understanding of addition and subtraction within 10, begin to use more efficient strategies and expand their understanding to include facts within 20. They learn about how addition and subtraction are related and begin to develop a part/part/whole understanding. During these studies, students learn about fact families and how to solve for missing parts and wholes. First grade students also begin to move away from the "counting all" strategies they learned in kindergarten to "counting on" for addition and "counting back" for subtraction. By the end of first grade, students are expected to be fluent with addition and subtraction facts within 10.
In first grade, students deepen their understanding of addition and subtraction within 10, begin to use more efficient strategies and expand their understanding to include facts within 20. They learn about how addition and subtraction are related and begin to develop a part/part/whole understanding. During these studies, students learn about fact families and how to solve for missing parts and wholes. First grade students also begin to move away from the "counting all" strategies they learned in kindergarten to "counting on" for addition and "counting back" for subtraction. By the end of first grade, students are expected to be fluent with addition and subtraction facts within 10.
"Counting On" Addition Strategy
Using a Number Line to "Count On" & "Count Back"
"Counting Back" and "Counting Up" Subtraction Strategies
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