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1oa6 Worksheets

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

1oa6 Worksheets - Adding Within 20 worksheet

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Adding Within 20

1oa6

Add two whole numbers with sums up to 20 (e.g., 8 + 7).

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1oa6 Worksheets - Adding Within 20 (horizontal) worksheet

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Adding Within 20 (horizontal)

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Add two whole numbers with sums up to 20 (e.g., 8 + 7).

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1oa6 Worksheets - Creating Tens worksheet

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Creating Tens

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Add within 20 by thinking of 10 and some more.

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1oa6 Worksheets - Finding Equivalent Addition Problems with 10 worksheet

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Finding Equivalent Addition Problems with 10

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Practice the "make a ten" strategy by rewriting an addition problem as 10 plus a leftover number
Learn that you can break apart numbers to make a group of ten, which makes adding easier
Find what's left over after making ten from two single-digit numbers

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1oa6 Worksheets - Add and Subtract (Within 20) worksheet

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Add and Subtract (Within 20)

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Add two numbers with sums up to 20.
Subtract a number from another number and find the difference up to 20.
Build speed and accuracy with basic addition and subtraction facts.

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1oa6 Worksheets - Subtracting within 20 (horizontal) worksheet

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Subtracting within 20 (horizontal)

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Subtract one number from another when both numbers are 20 or less.
Use subtraction facts to find the difference quickly and accurately.
Understand subtraction as taking away from a starting number.

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