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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 247 · 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. 1.21 + ? = 100
  2. 2.5 + ? = 10
  3. 3.74 + ? = 100
  4. 4.1 + ? = 10
  5. 5.72 + ? = 100
  6. 6.2 + ? = 10
  7. 7.33 + ? = 100
  8. 8.31 + ? = 100
  9. 9.7 + ? = 10
  10. 10.79 + ? = 100
  11. 11.17 + ? = 100
  12. 12.9 + ? = 10
  13. 13.22 + ? = 100
  14. 14.48 + ? = 100
  15. 15.30 + ? = 100
  16. 16.46 + ? = 100
  17. 17.6 + ? = 10
  18. 18.14 + ? = 100
  19. 19.24 + ? = 100
  20. 20.8 + ? = 10
  21. 21.40 + ? = 100
  22. 22.76 + ? = 100
  23. 23.18 + ? = 100
  24. 24.78 + ? = 100
  25. 25.73 + ? = 100
  26. 26.66 + ? = 100
  27. 27.4 + ? = 10
  28. 28.45 + ? = 100
  29. 29.3 + ? = 10
  30. 30.85 + ? = 100
  31. 31.23 + ? = 100
  32. 32.19 + ? = 100
  33. 33.67 + ? = 100
  34. 34.15 + ? = 100
  35. 35.53 + ? = 100
  36. 36.58 + ? = 100
  37. 37.12 + ? = 100
  38. 38.28 + ? = 100
  39. 39.38 + ? = 100
  40. 40.13 + ? = 100

Answer key

  1. 79
  2. 5
  3. 26
  4. 9
  5. 28
  6. 8
  7. 67
  8. 69
  9. 3
  10. 21
  11. 83
  12. 1
  13. 78
  14. 52
  15. 70
  16. 54
  17. 4
  18. 86
  19. 76
  20. 2
  21. 60
  22. 24
  23. 82
  24. 22
  25. 27
  26. 34
  27. 6
  28. 55
  29. 7
  30. 15
  31. 77
  32. 81
  33. 33
  34. 85
  35. 47
  36. 42
  37. 88
  38. 72
  39. 62
  40. 87

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