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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 578 · 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. 1.72 + ? = 100
  2. 2.65 + ? = 100
  3. 3.76 + ? = 100
  4. 4.23 + ? = 100
  5. 5.78 + ? = 100
  6. 6.71 + ? = 100
  7. 7.11 + ? = 100
  8. 8.8 + ? = 10
  9. 9.36 + ? = 100
  10. 10.5 + ? = 10
  11. 11.48 + ? = 100
  12. 12.31 + ? = 100
  13. 13.1 + ? = 10
  14. 14.2 + ? = 10
  15. 15.15 + ? = 100
  16. 16.82 + ? = 100
  17. 17.35 + ? = 100
  18. 18.74 + ? = 100
  19. 19.58 + ? = 100
  20. 20.45 + ? = 100
  21. 21.4 + ? = 10
  22. 22.9 + ? = 10
  23. 23.24 + ? = 100
  24. 24.13 + ? = 100
  25. 25.7 + ? = 10
  26. 26.6 + ? = 10
  27. 27.77 + ? = 100
  28. 28.30 + ? = 100
  29. 29.51 + ? = 100
  30. 30.38 + ? = 100
  31. 31.84 + ? = 100
  32. 32.81 + ? = 100
  33. 33.70 + ? = 100
  34. 34.62 + ? = 100
  35. 35.33 + ? = 100
  36. 36.56 + ? = 100
  37. 37.69 + ? = 100
  38. 38.3 + ? = 10
  39. 39.17 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 28
  2. 35
  3. 24
  4. 77
  5. 22
  6. 29
  7. 89
  8. 2
  9. 64
  10. 5
  11. 52
  12. 69
  13. 9
  14. 8
  15. 85
  16. 18
  17. 65
  18. 26
  19. 42
  20. 55
  21. 6
  22. 1
  23. 76
  24. 87
  25. 3
  26. 4
  27. 23
  28. 70
  29. 49
  30. 62
  31. 16
  32. 19
  33. 30
  34. 38
  35. 67
  36. 44
  37. 31
  38. 7
  39. 83
  40. 56

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