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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 72 · 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. 2.4 + ? = 10
  3. 3.60 + ? = 100
  4. 4.87 + ? = 100
  5. 5.5 + ? = 10
  6. 6.68 + ? = 100
  7. 7.3 + ? = 10
  8. 8.67 + ? = 100
  9. 9.1 + ? = 10
  10. 10.6 + ? = 10
  11. 11.83 + ? = 100
  12. 12.40 + ? = 100
  13. 13.8 + ? = 10
  14. 14.54 + ? = 100
  15. 15.9 + ? = 10
  16. 16.64 + ? = 100
  17. 17.77 + ? = 100
  18. 18.62 + ? = 100
  19. 19.65 + ? = 100
  20. 20.7 + ? = 10
  21. 21.12 + ? = 100
  22. 22.48 + ? = 100
  23. 23.78 + ? = 100
  24. 24.36 + ? = 100
  25. 25.59 + ? = 100
  26. 26.41 + ? = 100
  27. 27.11 + ? = 100
  28. 28.15 + ? = 100
  29. 29.49 + ? = 100
  30. 30.58 + ? = 100
  31. 31.70 + ? = 100
  32. 32.74 + ? = 100
  33. 33.23 + ? = 100
  34. 34.14 + ? = 100
  35. 35.34 + ? = 100
  36. 36.43 + ? = 100
  37. 37.71 + ? = 100
  38. 38.50 + ? = 100
  39. 39.30 + ? = 100
  40. 40.24 + ? = 100

Answer key

  1. 75
  2. 6
  3. 40
  4. 13
  5. 5
  6. 32
  7. 7
  8. 33
  9. 9
  10. 4
  11. 17
  12. 60
  13. 2
  14. 46
  15. 1
  16. 36
  17. 23
  18. 38
  19. 35
  20. 3
  21. 88
  22. 52
  23. 22
  24. 64
  25. 41
  26. 59
  27. 89
  28. 85
  29. 51
  30. 42
  31. 30
  32. 26
  33. 77
  34. 86
  35. 66
  36. 57
  37. 29
  38. 50
  39. 70
  40. 76

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