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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 232 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.6 + ? = 10
  2. 2.4 + ? = 10
  3. 3.18 + ? = 100
  4. 4.88 + ? = 100
  5. 5.40 + ? = 100
  6. 6.15 + ? = 100
  7. 7.2 + ? = 10
  8. 8.85 + ? = 100
  9. 9.8 + ? = 10
  10. 10.43 + ? = 100
  11. 11.9 + ? = 10
  12. 12.72 + ? = 100
  13. 13.1 + ? = 10
  14. 14.74 + ? = 100
  15. 15.26 + ? = 100
  16. 16.48 + ? = 100
  17. 17.80 + ? = 100
  18. 18.24 + ? = 100
  19. 19.3 + ? = 10
  20. 20.58 + ? = 100
  21. 21.73 + ? = 100
  22. 22.5 + ? = 10
  23. 23.77 + ? = 100
  24. 24.35 + ? = 100
  25. 25.27 + ? = 100
  26. 26.55 + ? = 100
  27. 27.30 + ? = 100
  28. 28.51 + ? = 100
  29. 29.28 + ? = 100
  30. 30.71 + ? = 100
  31. 31.25 + ? = 100
  32. 32.75 + ? = 100
  33. 33.14 + ? = 100
  34. 34.41 + ? = 100
  35. 35.42 + ? = 100
  36. 36.31 + ? = 100
  37. 37.57 + ? = 100
  38. 38.33 + ? = 100
  39. 39.78 + ? = 100
  40. 40.79 + ? = 100

Answer key

  1. 4
  2. 6
  3. 82
  4. 12
  5. 60
  6. 85
  7. 8
  8. 15
  9. 2
  10. 57
  11. 1
  12. 28
  13. 9
  14. 26
  15. 74
  16. 52
  17. 20
  18. 76
  19. 7
  20. 42
  21. 27
  22. 5
  23. 23
  24. 65
  25. 73
  26. 45
  27. 70
  28. 49
  29. 72
  30. 29
  31. 75
  32. 25
  33. 86
  34. 59
  35. 58
  36. 69
  37. 43
  38. 67
  39. 22
  40. 21

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