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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 255 · 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. 2.4 + ? = 10
  3. 3.3 + ? = 10
  4. 4.87 + ? = 100
  5. 5.56 + ? = 100
  6. 6.21 + ? = 100
  7. 7.5 + ? = 10
  8. 8.7 + ? = 10
  9. 9.47 + ? = 100
  10. 10.14 + ? = 100
  11. 11.34 + ? = 100
  12. 12.8 + ? = 10
  13. 13.18 + ? = 100
  14. 14.9 + ? = 10
  15. 15.19 + ? = 100
  16. 16.24 + ? = 100
  17. 17.81 + ? = 100
  18. 18.1 + ? = 10
  19. 19.46 + ? = 100
  20. 20.36 + ? = 100
  21. 21.11 + ? = 100
  22. 22.55 + ? = 100
  23. 23.28 + ? = 100
  24. 24.6 + ? = 10
  25. 25.32 + ? = 100
  26. 26.85 + ? = 100
  27. 27.54 + ? = 100
  28. 28.38 + ? = 100
  29. 29.76 + ? = 100
  30. 30.77 + ? = 100
  31. 31.23 + ? = 100
  32. 32.16 + ? = 100
  33. 33.22 + ? = 100
  34. 34.13 + ? = 100
  35. 35.35 + ? = 100
  36. 36.57 + ? = 100
  37. 37.30 + ? = 100
  38. 38.40 + ? = 100
  39. 39.68 + ? = 100
  40. 40.72 + ? = 100

Answer key

  1. 8
  2. 6
  3. 7
  4. 13
  5. 44
  6. 79
  7. 5
  8. 3
  9. 53
  10. 86
  11. 66
  12. 2
  13. 82
  14. 1
  15. 81
  16. 76
  17. 19
  18. 9
  19. 54
  20. 64
  21. 89
  22. 45
  23. 72
  24. 4
  25. 68
  26. 15
  27. 46
  28. 62
  29. 24
  30. 23
  31. 77
  32. 84
  33. 78
  34. 87
  35. 65
  36. 43
  37. 70
  38. 60
  39. 32
  40. 28

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