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In Grade 1, this expectation connects with place value understanding, properties of addition and subtraction, the relationship between addition and subtraction, and with representing and solving problems involving addition and subtraction.
In Grade 2, students fluently add and subtract within 20 using mental strategies and know from memory all sums of two one-digit numbers.
Look for and make use of structure.
How does counting on to add and subtract within 20 make it easier to use fingers even though we have only 10 fingers?