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Operations and Algebraic Thinking Add and subtract within 20. 6Understand the relationship between numbers and quantities; connect counting to cardinality.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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1oa6
 - adding-within-20 worksheet  - adding-within-20 worksheet
Adding Within 20
Each worksheet has 20 problems adding within 20.
 - adding-within-20-horizontal worksheet  - adding-within-20-horizontal worksheet
Adding Within 20 (horizontal)
Each worksheet has 20 problems finding the sum of numbers within 20.
 - creating-tens worksheet  - creating-tens worksheet
Creating Tens
Each worksheet contains 7 problems breaking an addition problem into an adding with ten problem.
 - finding-equivalent-addition-problems-with-10 worksheet  - finding-equivalent-addition-problems-with-10 worksheet
Finding Equivalent Addition Problems with 10
Each worksheet has 20 problems
 - add-and-subtract-within-20 worksheet  - add-and-subtract-within-20 worksheet
Add and Subtract (Within 20)
Each worksheet has 50 problems adding and subtracting below 20.
 - subtracting-within-20-horizontal worksheet  - subtracting-within-20-horizontal worksheet
Subtracting within 20 (horizontal)
Each worksheet has 20 problems subtracting within 20.
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