Sorting Addition Equations Worksheet
This sorting addition equations worksheet has 1st grade students solve twelve addition facts, sort them by sum, and find missing addends. An answer key is included for quick checking.
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About this resource
Description
How to Teach Addition
One number can have many names. The number 10 can be 6 + 4, 3 + 7, 5 + 5, or 8 + 2. This sorting addition equations worksheet helps 1st grade students solve addition facts within 20 and group the facts that make the same sum. When children see that different equations name the same number, they build number sense and learn that the equal sign means “the same as.”
About This Worksheet
The worksheet is titled “Numbers Have Many Names.” In the first part, students solve twelve addition problems in a number box and write each one under the sum it makes: 10, 12, or 15. Some problems start with the same number but make different sums, and some are turnaround facts like 8 + 7 and 7 + 8, so students must add every problem instead of guessing. In the second part, students fill in the missing number to make four equations true, such as 11 + 4 = 15. Use it for classwork, homework, small groups, a math center, or a quick check of addition fluency.
What’s Included
- A number box with twelve addition problems within 20
- A three-column sort chart for sums of 10, 12, and 15
- Four missing addend equations
- A full answer key
Why This Worksheet Helps Kids
First, sorting the equations by sum turns fact practice into a puzzle, so students stay focused on every problem. Second, seeing four equations in one column shows that a number can be made in many ways, which supports mental math strategies like making ten. Third, the missing addend equations ask students to think about addition in reverse, an important first grade skill that prepares them for subtraction.
Ideas for Teachers and Parents
Before the worksheet, give students ten counters and have them find every way to split them into two groups. After the worksheet, ask students to add one more equation of their own under each sum. For extra practice, write a number on the board and challenge the class to name it with as many addition facts as they can. This sorting addition equations worksheet also works well as a warm-up before a lesson on fact families, or pair it with another first grade addition worksheet for review.
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