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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 480 · 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. 1.32 + ? = 100
  2. 2.77 + ? = 100
  3. 3.42 + ? = 100
  4. 4.12 + ? = 100
  5. 5.50 + ? = 100
  6. 6.53 + ? = 100
  7. 7.44 + ? = 100
  8. 8.22 + ? = 100
  9. 9.85 + ? = 100
  10. 10.55 + ? = 100
  11. 11.35 + ? = 100
  12. 12.7 + ? = 10
  13. 13.76 + ? = 100
  14. 14.80 + ? = 100
  15. 15.51 + ? = 100
  16. 16.5 + ? = 10
  17. 17.21 + ? = 100
  18. 18.30 + ? = 100
  19. 19.28 + ? = 100
  20. 20.17 + ? = 100
  21. 21.34 + ? = 100
  22. 22.1 + ? = 10
  23. 23.59 + ? = 100
  24. 24.2 + ? = 10
  25. 25.52 + ? = 100
  26. 26.20 + ? = 100
  27. 27.86 + ? = 100
  28. 28.38 + ? = 100
  29. 29.29 + ? = 100
  30. 30.39 + ? = 100
  31. 31.6 + ? = 10
  32. 32.24 + ? = 100
  33. 33.4 + ? = 10
  34. 34.69 + ? = 100
  35. 35.60 + ? = 100
  36. 36.74 + ? = 100
  37. 37.46 + ? = 100
  38. 38.27 + ? = 100
  39. 39.8 + ? = 10
  40. 40.18 + ? = 100

Answer key

  1. 68
  2. 23
  3. 58
  4. 88
  5. 50
  6. 47
  7. 56
  8. 78
  9. 15
  10. 45
  11. 65
  12. 3
  13. 24
  14. 20
  15. 49
  16. 5
  17. 79
  18. 70
  19. 72
  20. 83
  21. 66
  22. 9
  23. 41
  24. 8
  25. 48
  26. 80
  27. 14
  28. 62
  29. 71
  30. 61
  31. 4
  32. 76
  33. 6
  34. 31
  35. 40
  36. 26
  37. 54
  38. 73
  39. 2
  40. 82

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