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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 525 · 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. 1.30 + ? = 100
  2. 2.6 + ? = 10
  3. 3.9 + ? = 10
  4. 4.8 + ? = 10
  5. 5.2 + ? = 10
  6. 6.87 + ? = 100
  7. 7.69 + ? = 100
  8. 8.24 + ? = 100
  9. 9.5 + ? = 10
  10. 10.47 + ? = 100
  11. 11.1 + ? = 10
  12. 12.39 + ? = 100
  13. 13.37 + ? = 100
  14. 14.17 + ? = 100
  15. 15.85 + ? = 100
  16. 16.3 + ? = 10
  17. 17.60 + ? = 100
  18. 18.57 + ? = 100
  19. 19.45 + ? = 100
  20. 20.73 + ? = 100
  21. 21.58 + ? = 100
  22. 22.50 + ? = 100
  23. 23.81 + ? = 100
  24. 24.75 + ? = 100
  25. 25.51 + ? = 100
  26. 26.83 + ? = 100
  27. 27.44 + ? = 100
  28. 28.26 + ? = 100
  29. 29.64 + ? = 100
  30. 30.86 + ? = 100
  31. 31.4 + ? = 10
  32. 32.55 + ? = 100
  33. 33.80 + ? = 100
  34. 34.7 + ? = 10
  35. 35.32 + ? = 100
  36. 36.53 + ? = 100
  37. 37.11 + ? = 100
  38. 38.61 + ? = 100
  39. 39.25 + ? = 100
  40. 40.33 + ? = 100

Answer key

  1. 70
  2. 4
  3. 1
  4. 2
  5. 8
  6. 13
  7. 31
  8. 76
  9. 5
  10. 53
  11. 9
  12. 61
  13. 63
  14. 83
  15. 15
  16. 7
  17. 40
  18. 43
  19. 55
  20. 27
  21. 42
  22. 50
  23. 19
  24. 25
  25. 49
  26. 17
  27. 56
  28. 74
  29. 36
  30. 14
  31. 6
  32. 45
  33. 20
  34. 3
  35. 68
  36. 47
  37. 89
  38. 39
  39. 75
  40. 67

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