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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 544 · 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. 1.54 + ? = 100
  2. 2.73 + ? = 100
  3. 3.56 + ? = 100
  4. 4.16 + ? = 100
  5. 5.32 + ? = 100
  6. 6.2 + ? = 10
  7. 7.15 + ? = 100
  8. 8.14 + ? = 100
  9. 9.47 + ? = 100
  10. 10.37 + ? = 100
  11. 11.80 + ? = 100
  12. 12.8 + ? = 10
  13. 13.31 + ? = 100
  14. 14.79 + ? = 100
  15. 15.3 + ? = 10
  16. 16.71 + ? = 100
  17. 17.6 + ? = 10
  18. 18.70 + ? = 100
  19. 19.7 + ? = 10
  20. 20.30 + ? = 100
  21. 21.55 + ? = 100
  22. 22.53 + ? = 100
  23. 23.13 + ? = 100
  24. 24.17 + ? = 100
  25. 25.52 + ? = 100
  26. 26.26 + ? = 100
  27. 27.84 + ? = 100
  28. 28.63 + ? = 100
  29. 29.11 + ? = 100
  30. 30.4 + ? = 10
  31. 31.1 + ? = 10
  32. 32.5 + ? = 10
  33. 33.9 + ? = 10
  34. 34.81 + ? = 100
  35. 35.74 + ? = 100
  36. 36.49 + ? = 100
  37. 37.48 + ? = 100
  38. 38.57 + ? = 100
  39. 39.82 + ? = 100
  40. 40.21 + ? = 100

Answer key

  1. 46
  2. 27
  3. 44
  4. 84
  5. 68
  6. 8
  7. 85
  8. 86
  9. 53
  10. 63
  11. 20
  12. 2
  13. 69
  14. 21
  15. 7
  16. 29
  17. 4
  18. 30
  19. 3
  20. 70
  21. 45
  22. 47
  23. 87
  24. 83
  25. 48
  26. 74
  27. 16
  28. 37
  29. 89
  30. 6
  31. 9
  32. 5
  33. 1
  34. 19
  35. 26
  36. 51
  37. 52
  38. 43
  39. 18
  40. 79

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