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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 339 · 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. 1.44 + ? = 100
  2. 2.79 + ? = 100
  3. 3.50 + ? = 100
  4. 4.83 + ? = 100
  5. 5.64 + ? = 100
  6. 6.2 + ? = 10
  7. 7.81 + ? = 100
  8. 8.12 + ? = 100
  9. 9.82 + ? = 100
  10. 10.7 + ? = 10
  11. 11.88 + ? = 100
  12. 12.5 + ? = 10
  13. 13.25 + ? = 100
  14. 14.3 + ? = 10
  15. 15.58 + ? = 100
  16. 16.21 + ? = 100
  17. 17.1 + ? = 10
  18. 18.51 + ? = 100
  19. 19.4 + ? = 10
  20. 20.69 + ? = 100
  21. 21.6 + ? = 10
  22. 22.18 + ? = 100
  23. 23.86 + ? = 100
  24. 24.34 + ? = 100
  25. 25.63 + ? = 100
  26. 26.84 + ? = 100
  27. 27.59 + ? = 100
  28. 28.48 + ? = 100
  29. 29.52 + ? = 100
  30. 30.49 + ? = 100
  31. 31.9 + ? = 10
  32. 32.47 + ? = 100
  33. 33.24 + ? = 100
  34. 34.17 + ? = 100
  35. 35.61 + ? = 100
  36. 36.15 + ? = 100
  37. 37.29 + ? = 100
  38. 38.37 + ? = 100
  39. 39.16 + ? = 100
  40. 40.40 + ? = 100

Answer key

  1. 56
  2. 21
  3. 50
  4. 17
  5. 36
  6. 8
  7. 19
  8. 88
  9. 18
  10. 3
  11. 12
  12. 5
  13. 75
  14. 7
  15. 42
  16. 79
  17. 9
  18. 49
  19. 6
  20. 31
  21. 4
  22. 82
  23. 14
  24. 66
  25. 37
  26. 16
  27. 41
  28. 52
  29. 48
  30. 51
  31. 1
  32. 53
  33. 76
  34. 83
  35. 39
  36. 85
  37. 71
  38. 63
  39. 84
  40. 60

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