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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 701 · 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. 1.56 + ? = 100
  2. 2.58 + ? = 100
  3. 3.87 + ? = 100
  4. 4.49 + ? = 100
  5. 5.86 + ? = 100
  6. 6.54 + ? = 100
  7. 7.64 + ? = 100
  8. 8.3 + ? = 10
  9. 9.6 + ? = 10
  10. 10.2 + ? = 10
  11. 11.1 + ? = 10
  12. 12.45 + ? = 100
  13. 13.5 + ? = 10
  14. 14.79 + ? = 100
  15. 15.7 + ? = 10
  16. 16.4 + ? = 10
  17. 17.80 + ? = 100
  18. 18.13 + ? = 100
  19. 19.70 + ? = 100
  20. 20.73 + ? = 100
  21. 21.55 + ? = 100
  22. 22.53 + ? = 100
  23. 23.29 + ? = 100
  24. 24.8 + ? = 10
  25. 25.40 + ? = 100
  26. 26.31 + ? = 100
  27. 27.59 + ? = 100
  28. 28.12 + ? = 100
  29. 29.9 + ? = 10
  30. 30.82 + ? = 100
  31. 31.75 + ? = 100
  32. 32.27 + ? = 100
  33. 33.47 + ? = 100
  34. 34.57 + ? = 100
  35. 35.30 + ? = 100
  36. 36.15 + ? = 100
  37. 37.41 + ? = 100
  38. 38.42 + ? = 100
  39. 39.24 + ? = 100
  40. 40.76 + ? = 100

Answer key

  1. 44
  2. 42
  3. 13
  4. 51
  5. 14
  6. 46
  7. 36
  8. 7
  9. 4
  10. 8
  11. 9
  12. 55
  13. 5
  14. 21
  15. 3
  16. 6
  17. 20
  18. 87
  19. 30
  20. 27
  21. 45
  22. 47
  23. 71
  24. 2
  25. 60
  26. 69
  27. 41
  28. 88
  29. 1
  30. 18
  31. 25
  32. 73
  33. 53
  34. 43
  35. 70
  36. 85
  37. 59
  38. 58
  39. 76
  40. 24

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