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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 491 · 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. 1.25 + ? = 100
  2. 2.2 + ? = 10
  3. 3.7 + ? = 10
  4. 4.3 + ? = 10
  5. 5.42 + ? = 100
  6. 6.83 + ? = 100
  7. 7.70 + ? = 100
  8. 8.1 + ? = 10
  9. 9.4 + ? = 10
  10. 10.77 + ? = 100
  11. 11.48 + ? = 100
  12. 12.27 + ? = 100
  13. 13.13 + ? = 100
  14. 14.62 + ? = 100
  15. 15.55 + ? = 100
  16. 16.85 + ? = 100
  17. 17.9 + ? = 10
  18. 18.5 + ? = 10
  19. 19.39 + ? = 100
  20. 20.20 + ? = 100
  21. 21.46 + ? = 100
  22. 22.58 + ? = 100
  23. 23.79 + ? = 100
  24. 24.37 + ? = 100
  25. 25.8 + ? = 10
  26. 26.14 + ? = 100
  27. 27.50 + ? = 100
  28. 28.32 + ? = 100
  29. 29.80 + ? = 100
  30. 30.74 + ? = 100
  31. 31.47 + ? = 100
  32. 32.57 + ? = 100
  33. 33.6 + ? = 10
  34. 34.76 + ? = 100
  35. 35.26 + ? = 100
  36. 36.52 + ? = 100
  37. 37.33 + ? = 100
  38. 38.56 + ? = 100
  39. 39.17 + ? = 100
  40. 40.59 + ? = 100

Answer key

  1. 75
  2. 8
  3. 3
  4. 7
  5. 58
  6. 17
  7. 30
  8. 9
  9. 6
  10. 23
  11. 52
  12. 73
  13. 87
  14. 38
  15. 45
  16. 15
  17. 1
  18. 5
  19. 61
  20. 80
  21. 54
  22. 42
  23. 21
  24. 63
  25. 2
  26. 86
  27. 50
  28. 68
  29. 20
  30. 26
  31. 53
  32. 43
  33. 4
  34. 24
  35. 74
  36. 48
  37. 67
  38. 44
  39. 83
  40. 41

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