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Mixed Facts Within 20 is a free printable Grade 1 math worksheet on judging facts within 20 rather than producing them, aligned to Common Core standard 1.OA.C.6. It prints 12 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 5 of 25 · the same problems every time you open this link.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Mixed Facts Within 20

1.OA.C.6

NameDate

Write true or false. If false, write the right answer.

1.True or false? 9 + 8 = 17
2.True or false? 8 − 3 = 3
3.True or false? 11 + 7 = 18
4.True or false? 11 − 8 = 3
5.True or false? 4 + 7 = 11
6.True or false? 8 − 7 = 2
7.True or false? 5 − 3 = 2
8.True or false? 11 − 7 = 2
9.True or false? 5 − 2 = 5
10.True or false? 9 + 8 = 19
11.True or false? 10 − 7 = 3
12.True or false? 7 + 6 = 11

LessonPrint · 1.OA.C.6 · Set 5 · free to copy for classroom use

Answer key — Mixed Facts Within 20

Set 5. Prints on its own sheet.

  1. 1.true
  2. 2.false — 5
  3. 3.true
  4. 4.true
  5. 5.true
  6. 6.false — 1
  7. 7.true
  8. 8.false — 4
  9. 9.false — 3
  10. 10.false — 17
  11. 11.true
  12. 12.false — 13

Last reviewed 2026-09-05. Aligned to 1.OA.C.6 of the Common Core State Standards for Mathematics.