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Math Worksheets

Lessons for First Grade

Free Printable Worksheets

Printable “1-digit Addition” worksheets:

Addition within 10 (eg. 3 + 5)

Addition within 20 (eg. 6 + 8)

Mixed Single Digit Addition

Sums across 10

Adding numbers that cross over the tens place and reach double digits is an essential concept in early math learning.

Here are some key strategies to help the students:

- Place Value Understanding: Use blocks, counters, or ten frames to visualize the numbers being added. This helps the students see how the ones combine and when a ten is formed.
- Counting On: Start with the larger number and count on the smaller number. For example, for 7 + 4, start at 7 and count 4 more: 8, 9, 10, 11.
- Make a Ten Strategy: Break down the smaller number to make a ten with the larger number. For example, 8 + 5 can be thought of as 8 + 2 + 3, making 10 + 3 = 13. Model with manipulatives: Use blocks or counters to physically show how combining some of the ones makes a ten.
- Practice and Reinforcement:

Encourage students to practice addition problems where the sum crosses 10, as this helps reinforce their understanding of place value, addition strategies, and the concept of crossing a group of ten. It’s an important step in developing fluency in addition skills.

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

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

(Answers on the second page.)

Sums Across 10 Worksheet #1

Sums Across 10 Worksheet #2

Sums Across 10 Worksheet #3

Sums Across 10 Worksheet #4

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

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

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