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Printable “Addition across 10” worksheets:

Sums across 10 (eg. 6 + 8)

Addition across 10 (eg. 39 + 5)

Here are some strategies for adding two numbers resulting in a sum exceeding 10 using mental math:

- Make a Ten:

This strategy works best when one number is close to 10, and the other has some ones that can be “borrowed” to create a ten with the first number.

Example: 18 + 5 becomes 18 + 2 + 3 = 20 + 3 = 13. - Counting On:

Start with the larger number and count on the smaller number. This is particularly useful when dealing with small increments. Example: 27 + 2 becomes 28, 29. - Double and Adjust:

If both numbers are close to a double, add the double of the larger number and adjust by adding or subtracting the difference between the smaller number and its double.

Example: 18 + 17 can be done as 18 + 18 - 1 = 36 - 1 = 35.

Tips:

Practice regularly to improve your speed and accuracy.

Choose the strategy that works best for you and the specific problem.

Start with simpler problems and gradually increase the difficulty.

Click on the following worksheet to get a printable pdf document.

Scroll down the page for more **Addition Across 10 Worksheets**.

(Answers on the second page.)

Addition Across 10 Worksheet #1

Addition Across 10 Worksheet #2

Missing Addend (sums < 10) (eg. __ + 5 = 7)

Missing Addend Word Problems (eg. 8 + __ = 17)

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