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Addition & Subtraction within 20 - ncrn.cornell.edu

The following worksheets and activities focus students’ attention on using 10 to subtract to help them decompose numbers within 20. In order to use 10 subtract, students need to be able to break apart numbers into 1 and a number and 2 and a number. Use 10 is most effectively learned when adding or subtracting +9 and +8, so problem sets focus on