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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 338 · 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. 1.29 + ? = 100
  2. 2.5 + ? = 10
  3. 3.25 + ? = 100
  4. 4.43 + ? = 100
  5. 5.47 + ? = 100
  6. 6.30 + ? = 100
  7. 7.4 + ? = 10
  8. 8.52 + ? = 100
  9. 9.55 + ? = 100
  10. 10.1 + ? = 10
  11. 11.2 + ? = 10
  12. 12.60 + ? = 100
  13. 13.16 + ? = 100
  14. 14.26 + ? = 100
  15. 15.79 + ? = 100
  16. 16.66 + ? = 100
  17. 17.61 + ? = 100
  18. 18.9 + ? = 10
  19. 19.80 + ? = 100
  20. 20.72 + ? = 100
  21. 21.54 + ? = 100
  22. 22.6 + ? = 10
  23. 23.18 + ? = 100
  24. 24.69 + ? = 100
  25. 25.23 + ? = 100
  26. 26.42 + ? = 100
  27. 27.39 + ? = 100
  28. 28.63 + ? = 100
  29. 29.41 + ? = 100
  30. 30.85 + ? = 100
  31. 31.88 + ? = 100
  32. 32.46 + ? = 100
  33. 33.3 + ? = 10
  34. 34.15 + ? = 100
  35. 35.53 + ? = 100
  36. 36.86 + ? = 100
  37. 37.7 + ? = 10
  38. 38.35 + ? = 100
  39. 39.87 + ? = 100
  40. 40.40 + ? = 100

Answer key

  1. 71
  2. 5
  3. 75
  4. 57
  5. 53
  6. 70
  7. 6
  8. 48
  9. 45
  10. 9
  11. 8
  12. 40
  13. 84
  14. 74
  15. 21
  16. 34
  17. 39
  18. 1
  19. 20
  20. 28
  21. 46
  22. 4
  23. 82
  24. 31
  25. 77
  26. 58
  27. 61
  28. 37
  29. 59
  30. 15
  31. 12
  32. 54
  33. 7
  34. 85
  35. 47
  36. 14
  37. 3
  38. 65
  39. 13
  40. 60

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