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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 327 · 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. 1.8 + ? = 10
  2. 2.9 + ? = 10
  3. 3.5 + ? = 10
  4. 4.20 + ? = 100
  5. 5.61 + ? = 100
  6. 6.50 + ? = 100
  7. 7.1 + ? = 10
  8. 8.2 + ? = 10
  9. 9.84 + ? = 100
  10. 10.19 + ? = 100
  11. 11.27 + ? = 100
  12. 12.74 + ? = 100
  13. 13.63 + ? = 100
  14. 14.7 + ? = 10
  15. 15.83 + ? = 100
  16. 16.65 + ? = 100
  17. 17.48 + ? = 100
  18. 18.85 + ? = 100
  19. 19.87 + ? = 100
  20. 20.68 + ? = 100
  21. 21.3 + ? = 10
  22. 22.14 + ? = 100
  23. 23.47 + ? = 100
  24. 24.18 + ? = 100
  25. 25.33 + ? = 100
  26. 26.89 + ? = 100
  27. 27.58 + ? = 100
  28. 28.77 + ? = 100
  29. 29.4 + ? = 10
  30. 30.53 + ? = 100
  31. 31.70 + ? = 100
  32. 32.16 + ? = 100
  33. 33.67 + ? = 100
  34. 34.11 + ? = 100
  35. 35.15 + ? = 100
  36. 36.26 + ? = 100
  37. 37.54 + ? = 100
  38. 38.17 + ? = 100
  39. 39.72 + ? = 100
  40. 40.34 + ? = 100

Answer key

  1. 2
  2. 1
  3. 5
  4. 80
  5. 39
  6. 50
  7. 9
  8. 8
  9. 16
  10. 81
  11. 73
  12. 26
  13. 37
  14. 3
  15. 17
  16. 35
  17. 52
  18. 15
  19. 13
  20. 32
  21. 7
  22. 86
  23. 53
  24. 82
  25. 67
  26. 11
  27. 42
  28. 23
  29. 6
  30. 47
  31. 30
  32. 84
  33. 33
  34. 89
  35. 85
  36. 74
  37. 46
  38. 83
  39. 28
  40. 66

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