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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 448 · 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. 1.73 + ? = 100
  2. 2.5 + ? = 10
  3. 3.38 + ? = 100
  4. 4.79 + ? = 100
  5. 5.83 + ? = 100
  6. 6.1 + ? = 10
  7. 7.8 + ? = 10
  8. 8.36 + ? = 100
  9. 9.77 + ? = 100
  10. 10.34 + ? = 100
  11. 11.9 + ? = 10
  12. 12.31 + ? = 100
  13. 13.15 + ? = 100
  14. 14.89 + ? = 100
  15. 15.2 + ? = 10
  16. 16.74 + ? = 100
  17. 17.3 + ? = 10
  18. 18.54 + ? = 100
  19. 19.86 + ? = 100
  20. 20.28 + ? = 100
  21. 21.16 + ? = 100
  22. 22.24 + ? = 100
  23. 23.13 + ? = 100
  24. 24.21 + ? = 100
  25. 25.35 + ? = 100
  26. 26.56 + ? = 100
  27. 27.7 + ? = 10
  28. 28.52 + ? = 100
  29. 29.18 + ? = 100
  30. 30.26 + ? = 100
  31. 31.51 + ? = 100
  32. 32.41 + ? = 100
  33. 33.69 + ? = 100
  34. 34.29 + ? = 100
  35. 35.61 + ? = 100
  36. 36.4 + ? = 10
  37. 37.59 + ? = 100
  38. 38.62 + ? = 100
  39. 39.33 + ? = 100
  40. 40.87 + ? = 100

Answer key

  1. 27
  2. 5
  3. 62
  4. 21
  5. 17
  6. 9
  7. 2
  8. 64
  9. 23
  10. 66
  11. 1
  12. 69
  13. 85
  14. 11
  15. 8
  16. 26
  17. 7
  18. 46
  19. 14
  20. 72
  21. 84
  22. 76
  23. 87
  24. 79
  25. 65
  26. 44
  27. 3
  28. 48
  29. 82
  30. 74
  31. 49
  32. 59
  33. 31
  34. 71
  35. 39
  36. 6
  37. 41
  38. 38
  39. 67
  40. 13

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