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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 503 · 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. 1.83 + ? = 100
  2. 2.8 + ? = 10
  3. 3.55 + ? = 100
  4. 4.65 + ? = 100
  5. 5.21 + ? = 100
  6. 6.7 + ? = 10
  7. 7.5 + ? = 10
  8. 8.1 + ? = 10
  9. 9.49 + ? = 100
  10. 10.23 + ? = 100
  11. 11.3 + ? = 10
  12. 12.31 + ? = 100
  13. 13.29 + ? = 100
  14. 14.19 + ? = 100
  15. 15.86 + ? = 100
  16. 16.89 + ? = 100
  17. 17.9 + ? = 10
  18. 18.60 + ? = 100
  19. 19.2 + ? = 10
  20. 20.6 + ? = 10
  21. 21.20 + ? = 100
  22. 22.11 + ? = 100
  23. 23.75 + ? = 100
  24. 24.58 + ? = 100
  25. 25.4 + ? = 10
  26. 26.70 + ? = 100
  27. 27.51 + ? = 100
  28. 28.14 + ? = 100
  29. 29.71 + ? = 100
  30. 30.63 + ? = 100
  31. 31.78 + ? = 100
  32. 32.38 + ? = 100
  33. 33.27 + ? = 100
  34. 34.52 + ? = 100
  35. 35.47 + ? = 100
  36. 36.73 + ? = 100
  37. 37.82 + ? = 100
  38. 38.37 + ? = 100
  39. 39.46 + ? = 100
  40. 40.85 + ? = 100

Answer key

  1. 17
  2. 2
  3. 45
  4. 35
  5. 79
  6. 3
  7. 5
  8. 9
  9. 51
  10. 77
  11. 7
  12. 69
  13. 71
  14. 81
  15. 14
  16. 11
  17. 1
  18. 40
  19. 8
  20. 4
  21. 80
  22. 89
  23. 25
  24. 42
  25. 6
  26. 30
  27. 49
  28. 86
  29. 29
  30. 37
  31. 22
  32. 62
  33. 73
  34. 48
  35. 53
  36. 27
  37. 18
  38. 63
  39. 54
  40. 15

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