How it works: a quick refresher
The rules this worksheet practices, then one problem worked from start to finish.
| Strategy | How it works |
|---|---|
| Start with the small numbers | Add two of the smaller numbers and look for the total in the group. |
| The answer is never the biggest | Every group has a number bigger than the answer, so check each one. |
| Cross off as you go | If a number can't be made from two others, put a small line through it. |
| Check the sentence | 2 + 4 = 6 only counts if 2, 4 and 6 are all in the group. |
Worked example
Find the number made from two others: 2, 4, 6 and 9.
- 1Try the two smallest: 2 + 4 = 6.
- 26 is in the group, so circle it.
- 3Check 9 too: 9 − 2 = 7, 9 − 4 = 5 and 9 − 6 = 3. There is no 7, 5 or 3, so 9 is not made from two others.
- 4Write 2 + 4 = 6.
Ready-made versions
Three fixed versions you can link to or share. Each is a PDF with its own answer key.
- Find the sum Worksheets, version 1Worksheet PDFAnswer key PDF
- Find the sum Worksheets, version 2Worksheet PDFAnswer key PDF
- Find the sum Worksheets, version 3Worksheet PDFAnswer key PDF
Grade level and standard
Written for kindergarten math (puzzles) and aligned to CCSS K.OA.A.3. It also works as review in later grades.
Common questions
- Is there an answer key?
- Yes. Every worksheet has a matching answer key with each answer worked on the same grid or layout as the question. The worksheet code printed at the bottom of each page pairs a sheet with its key.
- Can my child count on fingers?
- Yes. Counting on from the bigger number (4, then 5, 6) is a good strategy at this age. With practice the pairs that make each number start to stick.
- Is there a version to play on screen?
- Yes. Flip's Number Hunt has the same puzzles as a free game: endlessworksheets.com/games/number-hunt/sums-to-10.
- How many different versions are there?
- About a million per skill. Each time you press the button the problems are generated fresh, so you can print a different version for every student, a retake, or another night of practice.
- Are the worksheets free?
- Yes. They are free to print and copy for your home or classroom, with no sign-up.
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