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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 79 · 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. 1.30 + ? = 100
  2. 2.1 + ? = 10
  3. 3.2 + ? = 10
  4. 4.66 + ? = 100
  5. 5.69 + ? = 100
  6. 6.25 + ? = 100
  7. 7.43 + ? = 100
  8. 8.9 + ? = 10
  9. 9.5 + ? = 10
  10. 10.8 + ? = 10
  11. 11.26 + ? = 100
  12. 12.86 + ? = 100
  13. 13.37 + ? = 100
  14. 14.7 + ? = 10
  15. 15.3 + ? = 10
  16. 16.44 + ? = 100
  17. 17.6 + ? = 10
  18. 18.17 + ? = 100
  19. 19.50 + ? = 100
  20. 20.28 + ? = 100
  21. 21.34 + ? = 100
  22. 22.63 + ? = 100
  23. 23.11 + ? = 100
  24. 24.27 + ? = 100
  25. 25.4 + ? = 10
  26. 26.23 + ? = 100
  27. 27.14 + ? = 100
  28. 28.89 + ? = 100
  29. 29.12 + ? = 100
  30. 30.85 + ? = 100
  31. 31.39 + ? = 100
  32. 32.29 + ? = 100
  33. 33.59 + ? = 100
  34. 34.22 + ? = 100
  35. 35.51 + ? = 100
  36. 36.36 + ? = 100
  37. 37.64 + ? = 100
  38. 38.15 + ? = 100
  39. 39.70 + ? = 100
  40. 40.19 + ? = 100

Answer key

  1. 70
  2. 9
  3. 8
  4. 34
  5. 31
  6. 75
  7. 57
  8. 1
  9. 5
  10. 2
  11. 74
  12. 14
  13. 63
  14. 3
  15. 7
  16. 56
  17. 4
  18. 83
  19. 50
  20. 72
  21. 66
  22. 37
  23. 89
  24. 73
  25. 6
  26. 77
  27. 86
  28. 11
  29. 88
  30. 15
  31. 61
  32. 71
  33. 41
  34. 78
  35. 49
  36. 64
  37. 36
  38. 85
  39. 30
  40. 81

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