Add 1-Digit Numbers — Sums 10 to 18 Worksheets for 1st Grade
Add two single-digit numbers whose total is 10 or more (up to 9 + 9 = 18) — the facts that cross ten. 15 free printable worksheets, each with an answer key.
Save to PinterestFree Add 1-Digit Numbers — Sums 10 to 18 Worksheets
Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
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Worksheet #15
Add 1-Digit Numbers — Sums 10 to 18: what children learn
This is the harder tier of single-digit addition — every sum is 10 or more (up to 18), so each fact crosses ten. Making a ten first (8 + 5 is 8 + 2 + 3) or using a nearby double are the strategies that make these quick.
Add 1-Digit Numbers — Sums 10 to 18: worked example
8 + 7 = 15
Make a ten: 8 + 2 = 10, and 7 is 2 + 5, so 8 + 7 = 10 + 5 = 15. (Or use a double: 8 + 7 is one less than 8 + 8 = 16.)
Add 1-Digit Numbers — Sums 10 to 18: a common mistake to watch for
Kids who are only fluent with sums under 10 sometimes freeze on bigger combinations — encourage using a doubles or near-doubles shortcut instead of counting on by ones.
Add 1-Digit Numbers — Sums 10 to 18: how to help at home or in class
Practice making a ten with a ten frame and two colors of counters: put the larger number in first, then slide in counters from the second until the frame is full, and count whatever is left over. Say the steps aloud, such as nine plus six, take one from the six to make ten, then five more. Try different pairs each day. Your child is ready for harder work when most pairs take only a few seconds.
What is on these Add 1-Digit Numbers — Sums 10 to 18 worksheets
This set has 15 different worksheets for 1st grade, with 21 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Add the numbers and write the sum.”
Example questions like the ones on these worksheets, with their answers:
- 7 + 4 =11
- 4 + 6 =10
- 6 + 6 =12
- 9 + 7 =16
- 8 + 8 =16
- 8 + 9 =17
- 5 + 8 =13
- 6 + 9 =15
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers