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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 335 · 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. 1.2 + ? = 10
  2. 2.34 + ? = 100
  3. 3.13 + ? = 100
  4. 4.21 + ? = 100
  5. 5.11 + ? = 100
  6. 6.18 + ? = 100
  7. 7.4 + ? = 10
  8. 8.49 + ? = 100
  9. 9.14 + ? = 100
  10. 10.19 + ? = 100
  11. 11.15 + ? = 100
  12. 12.33 + ? = 100
  13. 13.38 + ? = 100
  14. 14.6 + ? = 10
  15. 15.43 + ? = 100
  16. 16.46 + ? = 100
  17. 17.5 + ? = 10
  18. 18.56 + ? = 100
  19. 19.80 + ? = 100
  20. 20.60 + ? = 100
  21. 21.1 + ? = 10
  22. 22.7 + ? = 10
  23. 23.8 + ? = 10
  24. 24.62 + ? = 100
  25. 25.83 + ? = 100
  26. 26.3 + ? = 10
  27. 27.9 + ? = 10
  28. 28.22 + ? = 100
  29. 29.51 + ? = 100
  30. 30.87 + ? = 100
  31. 31.53 + ? = 100
  32. 32.35 + ? = 100
  33. 33.85 + ? = 100
  34. 34.70 + ? = 100
  35. 35.45 + ? = 100
  36. 36.69 + ? = 100
  37. 37.81 + ? = 100
  38. 38.24 + ? = 100
  39. 39.64 + ? = 100
  40. 40.84 + ? = 100

Answer key

  1. 8
  2. 66
  3. 87
  4. 79
  5. 89
  6. 82
  7. 6
  8. 51
  9. 86
  10. 81
  11. 85
  12. 67
  13. 62
  14. 4
  15. 57
  16. 54
  17. 5
  18. 44
  19. 20
  20. 40
  21. 9
  22. 3
  23. 2
  24. 38
  25. 17
  26. 7
  27. 1
  28. 78
  29. 49
  30. 13
  31. 47
  32. 65
  33. 15
  34. 30
  35. 55
  36. 31
  37. 19
  38. 76
  39. 36
  40. 16

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