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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 254 · 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. 1.5 + ? = 10
  2. 2.8 + ? = 10
  3. 3.49 + ? = 100
  4. 4.33 + ? = 100
  5. 5.86 + ? = 100
  6. 6.2 + ? = 10
  7. 7.7 + ? = 10
  8. 8.31 + ? = 100
  9. 9.63 + ? = 100
  10. 10.52 + ? = 100
  11. 11.88 + ? = 100
  12. 12.68 + ? = 100
  13. 13.6 + ? = 10
  14. 14.41 + ? = 100
  15. 15.19 + ? = 100
  16. 16.9 + ? = 10
  17. 17.48 + ? = 100
  18. 18.66 + ? = 100
  19. 19.50 + ? = 100
  20. 20.85 + ? = 100
  21. 21.64 + ? = 100
  22. 22.78 + ? = 100
  23. 23.30 + ? = 100
  24. 24.3 + ? = 10
  25. 25.71 + ? = 100
  26. 26.1 + ? = 10
  27. 27.4 + ? = 10
  28. 28.83 + ? = 100
  29. 29.29 + ? = 100
  30. 30.56 + ? = 100
  31. 31.34 + ? = 100
  32. 32.24 + ? = 100
  33. 33.20 + ? = 100
  34. 34.17 + ? = 100
  35. 35.15 + ? = 100
  36. 36.18 + ? = 100
  37. 37.37 + ? = 100
  38. 38.21 + ? = 100
  39. 39.57 + ? = 100
  40. 40.81 + ? = 100

Answer key

  1. 5
  2. 2
  3. 51
  4. 67
  5. 14
  6. 8
  7. 3
  8. 69
  9. 37
  10. 48
  11. 12
  12. 32
  13. 4
  14. 59
  15. 81
  16. 1
  17. 52
  18. 34
  19. 50
  20. 15
  21. 36
  22. 22
  23. 70
  24. 7
  25. 29
  26. 9
  27. 6
  28. 17
  29. 71
  30. 44
  31. 66
  32. 76
  33. 80
  34. 83
  35. 85
  36. 82
  37. 63
  38. 79
  39. 43
  40. 19

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