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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 95 · 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. 2.4 + ? = 10
  3. 3.2 + ? = 10
  4. 4.8 + ? = 10
  5. 5.1 + ? = 10
  6. 6.5 + ? = 10
  7. 7.72 + ? = 100
  8. 8.34 + ? = 100
  9. 9.29 + ? = 100
  10. 10.69 + ? = 100
  11. 11.46 + ? = 100
  12. 12.42 + ? = 100
  13. 13.31 + ? = 100
  14. 14.26 + ? = 100
  15. 15.7 + ? = 10
  16. 16.62 + ? = 100
  17. 17.45 + ? = 100
  18. 18.33 + ? = 100
  19. 19.17 + ? = 100
  20. 20.70 + ? = 100
  21. 21.23 + ? = 100
  22. 22.11 + ? = 100
  23. 23.3 + ? = 10
  24. 24.53 + ? = 100
  25. 25.24 + ? = 100
  26. 26.60 + ? = 100
  27. 27.49 + ? = 100
  28. 28.28 + ? = 100
  29. 29.20 + ? = 100
  30. 30.9 + ? = 10
  31. 31.83 + ? = 100
  32. 32.41 + ? = 100
  33. 33.12 + ? = 100
  34. 34.30 + ? = 100
  35. 35.55 + ? = 100
  36. 36.37 + ? = 100
  37. 37.80 + ? = 100
  38. 38.35 + ? = 100
  39. 39.6 + ? = 10
  40. 40.15 + ? = 100

Answer key

  1. 79
  2. 6
  3. 8
  4. 2
  5. 9
  6. 5
  7. 28
  8. 66
  9. 71
  10. 31
  11. 54
  12. 58
  13. 69
  14. 74
  15. 3
  16. 38
  17. 55
  18. 67
  19. 83
  20. 30
  21. 77
  22. 89
  23. 7
  24. 47
  25. 76
  26. 40
  27. 51
  28. 72
  29. 80
  30. 1
  31. 17
  32. 59
  33. 88
  34. 70
  35. 45
  36. 63
  37. 20
  38. 65
  39. 4
  40. 85

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