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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 498 · 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. 1.72 + ? = 100
  2. 2.39 + ? = 100
  3. 3.89 + ? = 100
  4. 4.1 + ? = 10
  5. 5.83 + ? = 100
  6. 6.2 + ? = 10
  7. 7.3 + ? = 10
  8. 8.63 + ? = 100
  9. 9.67 + ? = 100
  10. 10.7 + ? = 10
  11. 11.8 + ? = 10
  12. 12.9 + ? = 10
  13. 13.47 + ? = 100
  14. 14.17 + ? = 100
  15. 15.23 + ? = 100
  16. 16.48 + ? = 100
  17. 17.54 + ? = 100
  18. 18.64 + ? = 100
  19. 19.35 + ? = 100
  20. 20.6 + ? = 10
  21. 21.55 + ? = 100
  22. 22.4 + ? = 10
  23. 23.25 + ? = 100
  24. 24.33 + ? = 100
  25. 25.79 + ? = 100
  26. 26.5 + ? = 10
  27. 27.45 + ? = 100
  28. 28.88 + ? = 100
  29. 29.20 + ? = 100
  30. 30.34 + ? = 100
  31. 31.76 + ? = 100
  32. 32.28 + ? = 100
  33. 33.49 + ? = 100
  34. 34.62 + ? = 100
  35. 35.24 + ? = 100
  36. 36.56 + ? = 100
  37. 37.29 + ? = 100
  38. 38.86 + ? = 100
  39. 39.66 + ? = 100
  40. 40.26 + ? = 100

Answer key

  1. 28
  2. 61
  3. 11
  4. 9
  5. 17
  6. 8
  7. 7
  8. 37
  9. 33
  10. 3
  11. 2
  12. 1
  13. 53
  14. 83
  15. 77
  16. 52
  17. 46
  18. 36
  19. 65
  20. 4
  21. 45
  22. 6
  23. 75
  24. 67
  25. 21
  26. 5
  27. 55
  28. 12
  29. 80
  30. 66
  31. 24
  32. 72
  33. 51
  34. 38
  35. 76
  36. 44
  37. 71
  38. 14
  39. 34
  40. 74

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