Grade 1 Mixed Addition and Subtraction to 20
Twenty mixed addition and subtraction problems within 20 for grade 1 — the real task is reading the sign before working. Printable PDF with answers.
Look at the sign in each problem. Add or subtract to find the answer.
- 1.4 + 2 =
- 2.6 − 2 =
- 3.4 + 7 =
- 4.19 − 15 =
- 5.12 + 8 =
- 6.9 − 1 =
- 7.4 + 13 =
- 8.3 − 1 =
- 9.12 + 7 =
- 10.17 − 15 =
- 11.10 + 1 =
- 12.18 − 4 =
- 13.2 + 11 =
- 14.4 − 1 =
- 15.2 + 14 =
- 16.20 − 17 =
- 17.5 + 5 =
- 18.17 − 7 =
- 19.7 + 6 =
- 20.15 − 1 =
What this worksheet covers
The sheet holds twenty mixed problems and prints to a single black-and-white page; the answers follow on page two. What makes this set particular: five of the twenty problems require regrouping and the rest do not, so the two cases are mixed rather than blocked together; numbers reach 20. Grade 1, Operations & Algebraic Thinking, Common Core 1.OA.6: that is the exact slot this page fills.
Skills practiced
At this point in the sequence, work in mixed operations is really about recognizing addition versus subtraction situations. To finish it, a student has to regroup past ten rather than counting up one at a time. A right answer arrived at by an unreliable route is worth less here than a slower, repeatable one.
How to use this worksheet
Sit alongside for this one. At grade 1 the useful information is not the score but which problems drew a pause, so watch for hesitation rather than waiting for the finished page. Mark it together rather than handing it back scored. The conversation about a wrong answer is where the teaching happens.
One mistake to watch for
The operation symbol is misread and the previous problem's operation is repeated.
Blocked practice has trained the student to set an operation once per page rather than per problem.
Have the operation circled before solving, and use mixed pages routinely rather than as an occasional review.
Related worksheets
Also aligned to 1.OA.6
The same standard from a different angle. Worth reaching for when the skill needs another pass without repeating the identical page.
- Grade 1 Equal Groups: Repeated Addition to 20 — grade 1, 16 problems
- Grade 1 Addition Practice — grade 1, 18 problems
A step either side
The same topic one grade down and one grade up — the easier sheet is often the faster fix when this one is not landing.
- Grade 2 Mixed Addition and Subtraction Within 100 — grade 2, 20 problems
Print as many copies of this grade 1 mixed operations worksheet as you need. It was built for recognizing addition versus subtraction situations, and the answer key is already in the file.