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Ten more, ten less: 1st grade math

10 more / 10 less mentally. A free 1st grade lesson plan, a question set with answers and a printable sheet with its key. Copy it and make it yours.

Lesson plan

Goal

  • Students can do this: 10 more / 10 less mentally.

Teach (10 min)

  • 10 more adds 1 to the tens digit.
  • 10 less takes 1 from the tens digit.
  • Work one example on the board while students say each step aloud, then do one together.

Practise (15 min)

  • Students work the printable sheet in pairs, then alone.
  • Or practise it as a game with no sign-up: https://peabody.kids/math/numsense.g1_tenmore?lesson=1-numsense-tenmore-1&at=1

Exit ticket (5 min)

  • Three questions on a slip:
  • 1. What is 10 more than 50?
  • 2. What is 10 more than 10?
  • 3. What is 10 more than 60?

Question set

10 questions that read in words, easiest first. Questions that need a picture are on the printable sheet below.

  1. What is 10 more than 50?
  2. What is 10 more than 10?
  3. What is 10 more than 60?
  4. What is 10 less than 90?
  5. What is 10 more than 60?
  6. What is 10 more than 50?
  7. What is 10 less than 55?
  8. What is 10 less than 53?
  9. What is 10 more than 39?
  10. What is 10 less than 60?
Answers
  1. 60
  2. 20
  3. 70
  4. 80
  5. 70
  6. 60
  7. 45
  8. 43
  9. 49
  10. 50

Printable sheet

Name: ____________________   Date: ____________

Ten more, ten less (1st grade)

  1. What is 10 more than 30?
  2. What is 10 more than 80?
  3. What is 10 less than 20?
  4. What is 10 more than 50?
  5. What is 10 more than 41?
  6. What is 10 more than 56?
  7. What is 10 more than 28?
  8. What is 10 less than 106?
  9. What is 10 more than 96?
  10. What is 10 less than 99?
  11. What is 10 less than 98?
  12. What is 10 more than 92?
Key
  1. 40
  2. 90
  3. 10
  4. 60
  5. 51
  6. 66
  7. 38
  8. 96
  9. 106
  10. 89
  11. 88
  12. 102

Written by Peabody from its own skill pages. Free, no ads, no sign-in. Children can practise this on Peabody. More from teachers: teacher-shared resources.