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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 244 · 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. 1.35 + ? = 100
  2. 2.67 + ? = 100
  3. 3.4 + ? = 10
  4. 4.1 + ? = 10
  5. 5.7 + ? = 10
  6. 6.63 + ? = 100
  7. 7.88 + ? = 100
  8. 8.13 + ? = 100
  9. 9.71 + ? = 100
  10. 10.50 + ? = 100
  11. 11.68 + ? = 100
  12. 12.76 + ? = 100
  13. 13.2 + ? = 10
  14. 14.6 + ? = 10
  15. 15.79 + ? = 100
  16. 16.5 + ? = 10
  17. 17.16 + ? = 100
  18. 18.8 + ? = 10
  19. 19.57 + ? = 100
  20. 20.11 + ? = 100
  21. 21.9 + ? = 10
  22. 22.81 + ? = 100
  23. 23.61 + ? = 100
  24. 24.26 + ? = 100
  25. 25.36 + ? = 100
  26. 26.31 + ? = 100
  27. 27.83 + ? = 100
  28. 28.15 + ? = 100
  29. 29.69 + ? = 100
  30. 30.56 + ? = 100
  31. 31.64 + ? = 100
  32. 32.21 + ? = 100
  33. 33.60 + ? = 100
  34. 34.19 + ? = 100
  35. 35.25 + ? = 100
  36. 36.66 + ? = 100
  37. 37.40 + ? = 100
  38. 38.70 + ? = 100
  39. 39.3 + ? = 10
  40. 40.20 + ? = 100

Answer key

  1. 65
  2. 33
  3. 6
  4. 9
  5. 3
  6. 37
  7. 12
  8. 87
  9. 29
  10. 50
  11. 32
  12. 24
  13. 8
  14. 4
  15. 21
  16. 5
  17. 84
  18. 2
  19. 43
  20. 89
  21. 1
  22. 19
  23. 39
  24. 74
  25. 64
  26. 69
  27. 17
  28. 85
  29. 31
  30. 44
  31. 36
  32. 79
  33. 40
  34. 81
  35. 75
  36. 34
  37. 60
  38. 30
  39. 7
  40. 80

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