Two-Digit Plus One-Digit
Add the ones first. If you get 10 or more, carry 1 ten to the tens.
Fresh sheet anytime. Tap New sheet or reload for a different one. Tap + for up to 10.
This is sheet #14024601.
How to do it
- Add the ones first.
- If the ones make 10 or more, carry a ten.
- Add the tens. Write the answer.
Teaching tip
The small row on top is for a carried 1. Use it only when the ones add up to 10 or more. This sheet is aligned with Common Core 1.NBT.C.4.
About this worksheet
Adding a one-digit number to a two-digit number in a grid, sometimes making a new ten.
What kids practice
In first grade, adding within 100 means problems like 40 + 30, 52 + 20 and 46 + 7. Kids use what they know about tens and ones. Tens go with tens and ones go with ones. When the ones add up to 10 or more, those ones make a new ten.
Watch for
- Adding the one-digit number to the tens, so 46 + 7 becomes 116.
- Forgetting to carry the new ten when the ones add up to 10 or more.
- Writing 7 instead of 70 for 40 + 30.
It's free to print, with Fewer, Standard or More on the page and an answer key. See the full adding within 100 guide for 1st grade.
More sheets in this set
- See it all
1. Adding within 100 ChartAdding tens, adding tens to a number, making the next ten, and taking away tens. 
2. Add TensAdding multiples of 10 like 30 + 40, with rod pictures to count.
3. Add Tens to a NumberAdding a multiple of 10 to a two-digit number, like 34 + 20, in a lined-up grid.
5. Take Away TensSubtracting multiples of 10, like 70 - 30, with rod pictures to cross out. Matches 1.NBT.C.6.