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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 669 · 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. 1.78 + ? = 100
  2. 2.75 + ? = 100
  3. 3.58 + ? = 100
  4. 4.84 + ? = 100
  5. 5.69 + ? = 100
  6. 6.3 + ? = 10
  7. 7.6 + ? = 10
  8. 8.32 + ? = 100
  9. 9.5 + ? = 10
  10. 10.82 + ? = 100
  11. 11.2 + ? = 10
  12. 12.76 + ? = 100
  13. 13.65 + ? = 100
  14. 14.1 + ? = 10
  15. 15.85 + ? = 100
  16. 16.51 + ? = 100
  17. 17.61 + ? = 100
  18. 18.74 + ? = 100
  19. 19.52 + ? = 100
  20. 20.20 + ? = 100
  21. 21.24 + ? = 100
  22. 22.56 + ? = 100
  23. 23.63 + ? = 100
  24. 24.38 + ? = 100
  25. 25.16 + ? = 100
  26. 26.70 + ? = 100
  27. 27.21 + ? = 100
  28. 28.45 + ? = 100
  29. 29.43 + ? = 100
  30. 30.9 + ? = 10
  31. 31.8 + ? = 10
  32. 32.72 + ? = 100
  33. 33.42 + ? = 100
  34. 34.14 + ? = 100
  35. 35.86 + ? = 100
  36. 36.35 + ? = 100
  37. 37.19 + ? = 100
  38. 38.27 + ? = 100
  39. 39.4 + ? = 10
  40. 40.31 + ? = 100

Answer key

  1. 22
  2. 25
  3. 42
  4. 16
  5. 31
  6. 7
  7. 4
  8. 68
  9. 5
  10. 18
  11. 8
  12. 24
  13. 35
  14. 9
  15. 15
  16. 49
  17. 39
  18. 26
  19. 48
  20. 80
  21. 76
  22. 44
  23. 37
  24. 62
  25. 84
  26. 30
  27. 79
  28. 55
  29. 57
  30. 1
  31. 2
  32. 28
  33. 58
  34. 86
  35. 14
  36. 65
  37. 81
  38. 73
  39. 6
  40. 69

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