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Add with tens and ones: 1st grade math

Add within 100 with models (2-digit + 1-digit, + multiples of 10). 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: add within 100 with models (2-digit + 1-digit, + multiples of 10).

Teach (10 min)

  • Add tens to tens.
  • 3 tens + 4 tens = 7 tens = 70.
  • 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_addTens?lesson=1-numsense-addtens-1&at=1

Exit ticket (5 min)

  • Three questions on a slip:
  • 1. 20 + 80 = ?
  • 2. 40 + 20 = ?
  • 3. 20 + 70 = ?

Question set

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

  1. 20 + 80 = ?
  2. 40 + 20 = ?
  3. 20 + 70 = ?
  4. 10 + 30 = ?
  5. 70 + 20 = ?
  6. 30 + 10 = ?
  7. 40 + 60 = ?
  8. 50 + 20 = ?
  9. 10 + 50 = ?
  10. 30 + 30 = ?
Answers
  1. 100
  2. 60
  3. 90
  4. 40
  5. 90
  6. 40
  7. 100
  8. 70
  9. 60
  10. 60

Printable sheet

Name: ____________________   Date: ____________

Add with tens and ones (1st grade)

  1. 60 + 30 = ?
  2. 70 + 30 = ?
  3. 70 + 10 = ?
  4. 50 + 40 = ?
  5. 60 + 30 = ?
  6. 20 + 40 = ?
  7. 30 + 50 = ?
  8. 10 + 90 = ?
  9. 60 + 20 = ?
  10. 30 + 60 = ?
  11. 76 + 20 = ?
  12. 50 + 20 = ?
Key
  1. 90
  2. 100
  3. 80
  4. 90
  5. 90
  6. 60
  7. 80
  8. 100
  9. 80
  10. 90
  11. 96
  12. 70

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.