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.
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Three different problem sets — same skill, same layout, fresh numbers.
Preview — Set A
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
There are twenty mixed operations problems here — one page to work, one page of answers to check against — and Sets B and C repeat the layout with different numbers. Within that, five of the twenty column problems need regrouping and the rest do not, so the two cases are mixed rather than blocked and the numbers run as high as 20. Problems 7 and 14, for instance, are "4 + 13" and "4 − 1". It is written against Common Core 1.OA.6 — Operations & Algebraic Thinking, grade 1.
Skills practised
The grade 1 mixed operations sequence covers addition and subtraction within 20 on the same page, and fact families; this page sits inside it. What a student is asked to do here is grade 1 Mixed Addition and Subtraction to 20. Concretely, the sheet tests whether a student can regroup past ten rather than counting up one at a time. Thirteen different answers appear across the twenty problems, so a student cannot copy one result down the page.
About the drill format
A drill is straight practice: 20 problems of the same kind, laid out across the page with working space under each — problem 7, "4 + 13" is typical of the whole page. A drill that changes operation from problem to problem tests sign reading as much as computation.
Set A, Set B and Set C
Set A is the sheet as it was first published on MathSheetLab, and Sets B and C were derived from it problem by problem: each number became a slot redrawn with the same shape, and every answer was recomputed exactly. Where Set A's problem 11 is "10 + 1", Set B's is "10 + 3".
How to use this worksheet
Grade 1 attention runs short, so split these twenty mixed operations problems over two or three sittings rather than pushing through in one; a number line or counters within reach is a strategy, not a failure. Keep the key face down until all twenty problems are finished, then go through the misses together rather than only totalling the score.
One mistake to watch for
Fact families are memorised as four unrelated facts. Problem 14 on this grade 1 drill page, "4 − 1", is where to look for it.
The part-part-whole relationship behind them has not been made visible.
Draw one bar model and write all four equations from it, so the family is one picture with four sentences.
Other grade 1 mixed operations formats
The same skill in the other formats available at this grade.
- Timed Drill — Grade 1 Mixed Operations Timed Drill, 60 problems
- Missing Number — Grade 1 Mixed Operations Missing Number, 24 problems
- Mixed Review — Grade 1 Equal Groups: Repeated Addition to 20, 16 problems
- Word Problems — Grade 1 Sharing Equally, 12 problems
A step either side
The same format 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
Drill sheets in other grade 1 topics
No paywall and no account — download any set of this grade 1 mixed operations drill, and the answers for all twenty problems are in the matching key.