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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 245 · 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. 1.13 + ? = 100
  2. 2.63 + ? = 100
  3. 3.4 + ? = 10
  4. 4.8 + ? = 10
  5. 5.3 + ? = 10
  6. 6.29 + ? = 100
  7. 7.67 + ? = 100
  8. 8.88 + ? = 100
  9. 9.57 + ? = 100
  10. 10.20 + ? = 100
  11. 11.31 + ? = 100
  12. 12.7 + ? = 10
  13. 13.9 + ? = 10
  14. 14.59 + ? = 100
  15. 15.1 + ? = 10
  16. 16.34 + ? = 100
  17. 17.69 + ? = 100
  18. 18.54 + ? = 100
  19. 19.82 + ? = 100
  20. 20.85 + ? = 100
  21. 21.83 + ? = 100
  22. 22.22 + ? = 100
  23. 23.6 + ? = 10
  24. 24.84 + ? = 100
  25. 25.27 + ? = 100
  26. 26.36 + ? = 100
  27. 27.45 + ? = 100
  28. 28.30 + ? = 100
  29. 29.21 + ? = 100
  30. 30.35 + ? = 100
  31. 31.5 + ? = 10
  32. 32.79 + ? = 100
  33. 33.48 + ? = 100
  34. 34.46 + ? = 100
  35. 35.11 + ? = 100
  36. 36.58 + ? = 100
  37. 37.40 + ? = 100
  38. 38.66 + ? = 100
  39. 39.44 + ? = 100
  40. 40.76 + ? = 100

Answer key

  1. 87
  2. 37
  3. 6
  4. 2
  5. 7
  6. 71
  7. 33
  8. 12
  9. 43
  10. 80
  11. 69
  12. 3
  13. 1
  14. 41
  15. 9
  16. 66
  17. 31
  18. 46
  19. 18
  20. 15
  21. 17
  22. 78
  23. 4
  24. 16
  25. 73
  26. 64
  27. 55
  28. 70
  29. 79
  30. 65
  31. 5
  32. 21
  33. 52
  34. 54
  35. 89
  36. 42
  37. 60
  38. 34
  39. 56
  40. 24

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