Snowball Subtraction: Fluency within 20

Snowball Subtraction: Fluency within 20
Snowball Subtraction: Fluency within 20
Snowball Subtraction: Fluency within 20
Snowball Subtraction: Fluency within 20
Snowball Subtraction: Fluency within 20
Snowball Subtraction: Fluency within 20
Snowball Subtraction: Fluency within 20
Snowball Subtraction: Fluency within 20
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This is a snowball themed subtraction worksheet. It covers fluency within 20. It can be used as a whole group practice or as a practice in a math center.

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Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
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).
Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
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