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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 582 · 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. 1.15 + ? = 100
  2. 2.3 + ? = 10
  3. 3.5 + ? = 10
  4. 4.9 + ? = 10
  5. 5.58 + ? = 100
  6. 6.1 + ? = 10
  7. 7.8 + ? = 10
  8. 8.45 + ? = 100
  9. 9.51 + ? = 100
  10. 10.50 + ? = 100
  11. 11.2 + ? = 10
  12. 12.38 + ? = 100
  13. 13.52 + ? = 100
  14. 14.6 + ? = 10
  15. 15.81 + ? = 100
  16. 16.82 + ? = 100
  17. 17.66 + ? = 100
  18. 18.4 + ? = 10
  19. 19.79 + ? = 100
  20. 20.27 + ? = 100
  21. 21.21 + ? = 100
  22. 22.20 + ? = 100
  23. 23.57 + ? = 100
  24. 24.84 + ? = 100
  25. 25.32 + ? = 100
  26. 26.72 + ? = 100
  27. 27.77 + ? = 100
  28. 28.83 + ? = 100
  29. 29.19 + ? = 100
  30. 30.30 + ? = 100
  31. 31.17 + ? = 100
  32. 32.7 + ? = 10
  33. 33.76 + ? = 100
  34. 34.11 + ? = 100
  35. 35.44 + ? = 100
  36. 36.29 + ? = 100
  37. 37.64 + ? = 100
  38. 38.61 + ? = 100
  39. 39.49 + ? = 100
  40. 40.16 + ? = 100

Answer key

  1. 85
  2. 7
  3. 5
  4. 1
  5. 42
  6. 9
  7. 2
  8. 55
  9. 49
  10. 50
  11. 8
  12. 62
  13. 48
  14. 4
  15. 19
  16. 18
  17. 34
  18. 6
  19. 21
  20. 73
  21. 79
  22. 80
  23. 43
  24. 16
  25. 68
  26. 28
  27. 23
  28. 17
  29. 81
  30. 70
  31. 83
  32. 3
  33. 24
  34. 89
  35. 56
  36. 71
  37. 36
  38. 39
  39. 51
  40. 84

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