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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 121 · 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. 1.19 + ? = 100
  2. 2.27 + ? = 100
  3. 3.30 + ? = 100
  4. 4.8 + ? = 10
  5. 5.88 + ? = 100
  6. 6.18 + ? = 100
  7. 7.26 + ? = 100
  8. 8.2 + ? = 10
  9. 9.79 + ? = 100
  10. 10.9 + ? = 10
  11. 11.20 + ? = 100
  12. 12.3 + ? = 10
  13. 13.75 + ? = 100
  14. 14.28 + ? = 100
  15. 15.43 + ? = 100
  16. 16.76 + ? = 100
  17. 17.6 + ? = 10
  18. 18.31 + ? = 100
  19. 19.1 + ? = 10
  20. 20.4 + ? = 10
  21. 21.67 + ? = 100
  22. 22.80 + ? = 100
  23. 23.7 + ? = 10
  24. 24.64 + ? = 100
  25. 25.49 + ? = 100
  26. 26.57 + ? = 100
  27. 27.39 + ? = 100
  28. 28.16 + ? = 100
  29. 29.14 + ? = 100
  30. 30.32 + ? = 100
  31. 31.15 + ? = 100
  32. 32.5 + ? = 10
  33. 33.40 + ? = 100
  34. 34.81 + ? = 100
  35. 35.42 + ? = 100
  36. 36.63 + ? = 100
  37. 37.51 + ? = 100
  38. 38.44 + ? = 100
  39. 39.21 + ? = 100
  40. 40.65 + ? = 100

Answer key

  1. 81
  2. 73
  3. 70
  4. 2
  5. 12
  6. 82
  7. 74
  8. 8
  9. 21
  10. 1
  11. 80
  12. 7
  13. 25
  14. 72
  15. 57
  16. 24
  17. 4
  18. 69
  19. 9
  20. 6
  21. 33
  22. 20
  23. 3
  24. 36
  25. 51
  26. 43
  27. 61
  28. 84
  29. 86
  30. 68
  31. 85
  32. 5
  33. 60
  34. 19
  35. 58
  36. 37
  37. 49
  38. 56
  39. 79
  40. 35

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