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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 494 · 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. 2.21 + ? = 100
  3. 3.81 + ? = 100
  4. 4.13 + ? = 100
  5. 5.3 + ? = 10
  6. 6.73 + ? = 100
  7. 7.49 + ? = 100
  8. 8.1 + ? = 10
  9. 9.29 + ? = 100
  10. 10.9 + ? = 10
  11. 11.75 + ? = 100
  12. 12.8 + ? = 10
  13. 13.4 + ? = 10
  14. 14.35 + ? = 100
  15. 15.20 + ? = 100
  16. 16.5 + ? = 10
  17. 17.6 + ? = 10
  18. 18.85 + ? = 100
  19. 19.55 + ? = 100
  20. 20.19 + ? = 100
  21. 21.71 + ? = 100
  22. 22.36 + ? = 100
  23. 23.74 + ? = 100
  24. 24.30 + ? = 100
  25. 25.66 + ? = 100
  26. 26.65 + ? = 100
  27. 27.18 + ? = 100
  28. 28.88 + ? = 100
  29. 29.17 + ? = 100
  30. 30.24 + ? = 100
  31. 31.80 + ? = 100
  32. 32.22 + ? = 100
  33. 33.86 + ? = 100
  34. 34.64 + ? = 100
  35. 35.7 + ? = 10
  36. 36.43 + ? = 100
  37. 37.23 + ? = 100
  38. 38.12 + ? = 100
  39. 39.57 + ? = 100
  40. 40.72 + ? = 100

Answer key

  1. 8
  2. 79
  3. 19
  4. 87
  5. 7
  6. 27
  7. 51
  8. 9
  9. 71
  10. 1
  11. 25
  12. 2
  13. 6
  14. 65
  15. 80
  16. 5
  17. 4
  18. 15
  19. 45
  20. 81
  21. 29
  22. 64
  23. 26
  24. 70
  25. 34
  26. 35
  27. 82
  28. 12
  29. 83
  30. 76
  31. 20
  32. 78
  33. 14
  34. 36
  35. 3
  36. 57
  37. 77
  38. 88
  39. 43
  40. 28

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