1st Grade Videos - Add and subtract within 20.
Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
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Addition and Subtraction Song Fun song teaching addition and subtraction (2:31) |
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Khan - Basic Subtraction Introduction to subtraction first reviewing addition (8:32) |
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Khan - Basic Subtraction 2 Second part in the subtraction series from Sal (12:32) |
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Khan - Basic Subtraction 3 Part three in the subtraction series from Sal (18:26) |
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