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Grade 1 Missing Numbers in Equations Worksheet with Answers

Grade 1 (US) · Year 2 (UK) · Class 1 (India) · Math

Unit 2: Addition & Subtraction FactsUnderstanding EquationsCCSS 1.OA.D.8

Finding the unknown number in addition and subtraction equations such as __ + 4 = 9. This free early elementary worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Missing Numbers in Equations

Grade 1 · Math

Score___ / 12

Name

Class

Date

Learning goal: Understanding Equations · CCSS 1.OA.D.8

Directions: Fill in each blank.

Example

8 + ____ = 9

Answer: 1

RememberCounting on with a number line

012345678910111213145 + ? = 13 → count the hops: 8
  1. 1

    + 10 = 20

  2. 2

    10 - = 8

  3. 3

    + 1 = 9

  4. 4

    14 + = 17

  5. 5

    + 7 = 13

  6. 6

    + 7 = 18

  7. 7

    3 + = 5

  8. 8

    13 - = 3

  9. 9

    17 - = 11

  10. 10

    4 + = 14

  11. 11

    + 2 = 6

  12. 12

    4 + = 13

★ Challenge corner for fast finishers

In this magic square every row, column and diagonal adds up to 42. Row 1: 8, 18, 16 | Row 2: 22, 14, 6 | Row 3: ____, 10, 20. What is the missing number?

81816221461020

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/math/1/missing_addend

Answer key (click to show)
  1. 1.10
  2. 2.2
  3. 3.8
  4. 4.3
  5. 5.6
  6. 6.11
  7. 7.2
  8. 8.10
  9. 9.6
  10. 10.10
  11. 11.4
  12. 12.9
  13. ★12 (challenge corner)

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  • Keep it short: a few questions at a time works better than a whole page at once for young learners.
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