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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 73 · 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. 1.20 + ? = 100
  2. 2.66 + ? = 100
  3. 3.17 + ? = 100
  4. 4.51 + ? = 100
  5. 5.75 + ? = 100
  6. 6.56 + ? = 100
  7. 7.7 + ? = 10
  8. 8.73 + ? = 100
  9. 9.4 + ? = 10
  10. 10.3 + ? = 10
  11. 11.88 + ? = 100
  12. 12.9 + ? = 10
  13. 13.5 + ? = 10
  14. 14.54 + ? = 100
  15. 15.2 + ? = 10
  16. 16.61 + ? = 100
  17. 17.70 + ? = 100
  18. 18.1 + ? = 10
  19. 19.29 + ? = 100
  20. 20.28 + ? = 100
  21. 21.41 + ? = 100
  22. 22.46 + ? = 100
  23. 23.68 + ? = 100
  24. 24.34 + ? = 100
  25. 25.84 + ? = 100
  26. 26.74 + ? = 100
  27. 27.6 + ? = 10
  28. 28.62 + ? = 100
  29. 29.8 + ? = 10
  30. 30.60 + ? = 100
  31. 31.31 + ? = 100
  32. 32.63 + ? = 100
  33. 33.38 + ? = 100
  34. 34.81 + ? = 100
  35. 35.52 + ? = 100
  36. 36.47 + ? = 100
  37. 37.42 + ? = 100
  38. 38.37 + ? = 100
  39. 39.24 + ? = 100
  40. 40.80 + ? = 100

Answer key

  1. 80
  2. 34
  3. 83
  4. 49
  5. 25
  6. 44
  7. 3
  8. 27
  9. 6
  10. 7
  11. 12
  12. 1
  13. 5
  14. 46
  15. 8
  16. 39
  17. 30
  18. 9
  19. 71
  20. 72
  21. 59
  22. 54
  23. 32
  24. 66
  25. 16
  26. 26
  27. 4
  28. 38
  29. 2
  30. 40
  31. 69
  32. 37
  33. 62
  34. 19
  35. 48
  36. 53
  37. 58
  38. 63
  39. 76
  40. 20

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