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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 227 · 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. 1.89 + ? = 100
  2. 2.32 + ? = 100
  3. 3.45 + ? = 100
  4. 4.41 + ? = 100
  5. 5.5 + ? = 10
  6. 6.6 + ? = 10
  7. 7.2 + ? = 10
  8. 8.9 + ? = 10
  9. 9.60 + ? = 100
  10. 10.3 + ? = 10
  11. 11.1 + ? = 10
  12. 12.44 + ? = 100
  13. 13.7 + ? = 10
  14. 14.23 + ? = 100
  15. 15.69 + ? = 100
  16. 16.76 + ? = 100
  17. 17.38 + ? = 100
  18. 18.40 + ? = 100
  19. 19.87 + ? = 100
  20. 20.64 + ? = 100
  21. 21.84 + ? = 100
  22. 22.14 + ? = 100
  23. 23.26 + ? = 100
  24. 24.62 + ? = 100
  25. 25.68 + ? = 100
  26. 26.88 + ? = 100
  27. 27.30 + ? = 100
  28. 28.50 + ? = 100
  29. 29.59 + ? = 100
  30. 30.79 + ? = 100
  31. 31.12 + ? = 100
  32. 32.4 + ? = 10
  33. 33.20 + ? = 100
  34. 34.25 + ? = 100
  35. 35.18 + ? = 100
  36. 36.47 + ? = 100
  37. 37.13 + ? = 100
  38. 38.16 + ? = 100
  39. 39.8 + ? = 10
  40. 40.11 + ? = 100

Answer key

  1. 11
  2. 68
  3. 55
  4. 59
  5. 5
  6. 4
  7. 8
  8. 1
  9. 40
  10. 7
  11. 9
  12. 56
  13. 3
  14. 77
  15. 31
  16. 24
  17. 62
  18. 60
  19. 13
  20. 36
  21. 16
  22. 86
  23. 74
  24. 38
  25. 32
  26. 12
  27. 70
  28. 50
  29. 41
  30. 21
  31. 88
  32. 6
  33. 80
  34. 75
  35. 82
  36. 53
  37. 87
  38. 84
  39. 2
  40. 89

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