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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 259 · 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. 1.3 + ? = 10
  2. 2.9 + ? = 10
  3. 3.5 + ? = 10
  4. 4.21 + ? = 100
  5. 5.4 + ? = 10
  6. 6.7 + ? = 10
  7. 7.70 + ? = 100
  8. 8.85 + ? = 100
  9. 9.1 + ? = 10
  10. 10.2 + ? = 10
  11. 11.61 + ? = 100
  12. 12.62 + ? = 100
  13. 13.71 + ? = 100
  14. 14.38 + ? = 100
  15. 15.87 + ? = 100
  16. 16.14 + ? = 100
  17. 17.6 + ? = 10
  18. 18.26 + ? = 100
  19. 19.69 + ? = 100
  20. 20.58 + ? = 100
  21. 21.20 + ? = 100
  22. 22.17 + ? = 100
  23. 23.8 + ? = 10
  24. 24.89 + ? = 100
  25. 25.60 + ? = 100
  26. 26.54 + ? = 100
  27. 27.64 + ? = 100
  28. 28.25 + ? = 100
  29. 29.63 + ? = 100
  30. 30.81 + ? = 100
  31. 31.74 + ? = 100
  32. 32.57 + ? = 100
  33. 33.59 + ? = 100
  34. 34.28 + ? = 100
  35. 35.68 + ? = 100
  36. 36.23 + ? = 100
  37. 37.19 + ? = 100
  38. 38.30 + ? = 100
  39. 39.53 + ? = 100
  40. 40.45 + ? = 100

Answer key

  1. 7
  2. 1
  3. 5
  4. 79
  5. 6
  6. 3
  7. 30
  8. 15
  9. 9
  10. 8
  11. 39
  12. 38
  13. 29
  14. 62
  15. 13
  16. 86
  17. 4
  18. 74
  19. 31
  20. 42
  21. 80
  22. 83
  23. 2
  24. 11
  25. 40
  26. 46
  27. 36
  28. 75
  29. 37
  30. 19
  31. 26
  32. 43
  33. 41
  34. 72
  35. 32
  36. 77
  37. 81
  38. 70
  39. 47
  40. 55

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