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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 313 · 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. 1.2 + ? = 10
  2. 2.34 + ? = 100
  3. 3.4 + ? = 10
  4. 4.3 + ? = 10
  5. 5.68 + ? = 100
  6. 6.7 + ? = 10
  7. 7.27 + ? = 100
  8. 8.9 + ? = 10
  9. 9.16 + ? = 100
  10. 10.21 + ? = 100
  11. 11.65 + ? = 100
  12. 12.63 + ? = 100
  13. 13.74 + ? = 100
  14. 14.13 + ? = 100
  15. 15.31 + ? = 100
  16. 16.89 + ? = 100
  17. 17.62 + ? = 100
  18. 18.88 + ? = 100
  19. 19.79 + ? = 100
  20. 20.55 + ? = 100
  21. 21.6 + ? = 10
  22. 22.86 + ? = 100
  23. 23.76 + ? = 100
  24. 24.8 + ? = 10
  25. 25.5 + ? = 10
  26. 26.78 + ? = 100
  27. 27.46 + ? = 100
  28. 28.17 + ? = 100
  29. 29.23 + ? = 100
  30. 30.1 + ? = 10
  31. 31.39 + ? = 100
  32. 32.18 + ? = 100
  33. 33.24 + ? = 100
  34. 34.37 + ? = 100
  35. 35.61 + ? = 100
  36. 36.14 + ? = 100
  37. 37.56 + ? = 100
  38. 38.72 + ? = 100
  39. 39.11 + ? = 100
  40. 40.60 + ? = 100

Answer key

  1. 8
  2. 66
  3. 6
  4. 7
  5. 32
  6. 3
  7. 73
  8. 1
  9. 84
  10. 79
  11. 35
  12. 37
  13. 26
  14. 87
  15. 69
  16. 11
  17. 38
  18. 12
  19. 21
  20. 45
  21. 4
  22. 14
  23. 24
  24. 2
  25. 5
  26. 22
  27. 54
  28. 83
  29. 77
  30. 9
  31. 61
  32. 82
  33. 76
  34. 63
  35. 39
  36. 86
  37. 44
  38. 28
  39. 89
  40. 40

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