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What Did We Start With? is a free printable Grade 1 maths worksheet on unknown minuend, within fifteen, aligned to Common Core standard 1.OA.B.4. It prints 16 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 10 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.

What Did We Start With?

1.OA.B.4

NameDate

Work out each answer.

1.___ − 13 = 0
2.___ − 2 = 12
3.___ − 6 = 0
4.___ − 11 = 0
5.___ − 4 = 2
6.___ − 6 = 7
7.___ − 1 = 8
8.___ − 7 = 0
9.___ − 5 = 2
10.___ − 8 = 3
11.___ − 8 = 4
12.___ − 1 = 11
13.___ − 2 = 6
14.___ − 3 = 3
15.___ − 5 = 5
16.___ − 6 = 8

LessonPrint · 1.OA.B.4 · Set 10 · free to copy for classroom use

Answer key — What Did We Start With?

Set 10. Prints on its own sheet.

  1. 1.13
  2. 2.14
  3. 3.6
  4. 4.11
  5. 5.6
  6. 6.13
  7. 7.9
  8. 8.7
  9. 9.7
  10. 10.11
  11. 11.12
  12. 12.12
  13. 13.8
  14. 14.6
  15. 15.10
  16. 16.14

Last reviewed 2026-09-05. Aligned to 1.OA.B.4 of the Common Core State Standards for mathematics.