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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 61 · 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. 1.7 + ? = 10
  2. 2.73 + ? = 100
  3. 3.55 + ? = 100
  4. 4.38 + ? = 100
  5. 5.5 + ? = 10
  6. 6.21 + ? = 100
  7. 7.2 + ? = 10
  8. 8.31 + ? = 100
  9. 9.9 + ? = 10
  10. 10.61 + ? = 100
  11. 11.81 + ? = 100
  12. 12.58 + ? = 100
  13. 13.4 + ? = 10
  14. 14.88 + ? = 100
  15. 15.28 + ? = 100
  16. 16.3 + ? = 10
  17. 17.45 + ? = 100
  18. 18.6 + ? = 10
  19. 19.1 + ? = 10
  20. 20.42 + ? = 100
  21. 21.65 + ? = 100
  22. 22.17 + ? = 100
  23. 23.78 + ? = 100
  24. 24.43 + ? = 100
  25. 25.85 + ? = 100
  26. 26.36 + ? = 100
  27. 27.33 + ? = 100
  28. 28.64 + ? = 100
  29. 29.8 + ? = 10
  30. 30.47 + ? = 100
  31. 31.89 + ? = 100
  32. 32.87 + ? = 100
  33. 33.67 + ? = 100
  34. 34.86 + ? = 100
  35. 35.30 + ? = 100
  36. 36.51 + ? = 100
  37. 37.27 + ? = 100
  38. 38.52 + ? = 100
  39. 39.44 + ? = 100
  40. 40.24 + ? = 100

Answer key

  1. 3
  2. 27
  3. 45
  4. 62
  5. 5
  6. 79
  7. 8
  8. 69
  9. 1
  10. 39
  11. 19
  12. 42
  13. 6
  14. 12
  15. 72
  16. 7
  17. 55
  18. 4
  19. 9
  20. 58
  21. 35
  22. 83
  23. 22
  24. 57
  25. 15
  26. 64
  27. 67
  28. 36
  29. 2
  30. 53
  31. 11
  32. 13
  33. 33
  34. 14
  35. 70
  36. 49
  37. 73
  38. 48
  39. 56
  40. 76

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