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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 540 · 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. 1.6 + ? = 10
  2. 2.52 + ? = 100
  3. 3.63 + ? = 100
  4. 4.26 + ? = 100
  5. 5.59 + ? = 100
  6. 6.78 + ? = 100
  7. 7.2 + ? = 10
  8. 8.5 + ? = 10
  9. 9.42 + ? = 100
  10. 10.3 + ? = 10
  11. 11.83 + ? = 100
  12. 12.85 + ? = 100
  13. 13.89 + ? = 100
  14. 14.7 + ? = 10
  15. 15.60 + ? = 100
  16. 16.53 + ? = 100
  17. 17.16 + ? = 100
  18. 18.86 + ? = 100
  19. 19.1 + ? = 10
  20. 20.20 + ? = 100
  21. 21.23 + ? = 100
  22. 22.54 + ? = 100
  23. 23.37 + ? = 100
  24. 24.36 + ? = 100
  25. 25.81 + ? = 100
  26. 26.47 + ? = 100
  27. 27.4 + ? = 10
  28. 28.40 + ? = 100
  29. 29.56 + ? = 100
  30. 30.72 + ? = 100
  31. 31.11 + ? = 100
  32. 32.9 + ? = 10
  33. 33.25 + ? = 100
  34. 34.55 + ? = 100
  35. 35.75 + ? = 100
  36. 36.67 + ? = 100
  37. 37.71 + ? = 100
  38. 38.14 + ? = 100
  39. 39.79 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 4
  2. 48
  3. 37
  4. 74
  5. 41
  6. 22
  7. 8
  8. 5
  9. 58
  10. 7
  11. 17
  12. 15
  13. 11
  14. 3
  15. 40
  16. 47
  17. 84
  18. 14
  19. 9
  20. 80
  21. 77
  22. 46
  23. 63
  24. 64
  25. 19
  26. 53
  27. 6
  28. 60
  29. 44
  30. 28
  31. 89
  32. 1
  33. 75
  34. 45
  35. 25
  36. 33
  37. 29
  38. 86
  39. 21
  40. 56

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