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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 444 · 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. 1.71 + ? = 100
  2. 2.22 + ? = 100
  3. 3.53 + ? = 100
  4. 4.11 + ? = 100
  5. 5.45 + ? = 100
  6. 6.3 + ? = 10
  7. 7.62 + ? = 100
  8. 8.9 + ? = 10
  9. 9.79 + ? = 100
  10. 10.56 + ? = 100
  11. 11.70 + ? = 100
  12. 12.2 + ? = 10
  13. 13.6 + ? = 10
  14. 14.72 + ? = 100
  15. 15.76 + ? = 100
  16. 16.64 + ? = 100
  17. 17.30 + ? = 100
  18. 18.23 + ? = 100
  19. 19.19 + ? = 100
  20. 20.8 + ? = 10
  21. 21.37 + ? = 100
  22. 22.24 + ? = 100
  23. 23.1 + ? = 10
  24. 24.66 + ? = 100
  25. 25.34 + ? = 100
  26. 26.5 + ? = 10
  27. 27.4 + ? = 10
  28. 28.14 + ? = 100
  29. 29.59 + ? = 100
  30. 30.39 + ? = 100
  31. 31.7 + ? = 10
  32. 32.78 + ? = 100
  33. 33.17 + ? = 100
  34. 34.36 + ? = 100
  35. 35.48 + ? = 100
  36. 36.58 + ? = 100
  37. 37.12 + ? = 100
  38. 38.16 + ? = 100
  39. 39.52 + ? = 100
  40. 40.68 + ? = 100

Answer key

  1. 29
  2. 78
  3. 47
  4. 89
  5. 55
  6. 7
  7. 38
  8. 1
  9. 21
  10. 44
  11. 30
  12. 8
  13. 4
  14. 28
  15. 24
  16. 36
  17. 70
  18. 77
  19. 81
  20. 2
  21. 63
  22. 76
  23. 9
  24. 34
  25. 66
  26. 5
  27. 6
  28. 86
  29. 41
  30. 61
  31. 3
  32. 22
  33. 83
  34. 64
  35. 52
  36. 42
  37. 88
  38. 84
  39. 48
  40. 32

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