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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 423 · 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. 1.7 + ? = 10
  2. 2.6 + ? = 10
  3. 3.13 + ? = 100
  4. 4.86 + ? = 100
  5. 5.71 + ? = 100
  6. 6.9 + ? = 10
  7. 7.42 + ? = 100
  8. 8.2 + ? = 10
  9. 9.49 + ? = 100
  10. 10.69 + ? = 100
  11. 11.4 + ? = 10
  12. 12.1 + ? = 10
  13. 13.80 + ? = 100
  14. 14.3 + ? = 10
  15. 15.18 + ? = 100
  16. 16.5 + ? = 10
  17. 17.54 + ? = 100
  18. 18.23 + ? = 100
  19. 19.53 + ? = 100
  20. 20.50 + ? = 100
  21. 21.52 + ? = 100
  22. 22.16 + ? = 100
  23. 23.62 + ? = 100
  24. 24.41 + ? = 100
  25. 25.25 + ? = 100
  26. 26.82 + ? = 100
  27. 27.79 + ? = 100
  28. 28.33 + ? = 100
  29. 29.8 + ? = 10
  30. 30.48 + ? = 100
  31. 31.44 + ? = 100
  32. 32.88 + ? = 100
  33. 33.37 + ? = 100
  34. 34.76 + ? = 100
  35. 35.73 + ? = 100
  36. 36.38 + ? = 100
  37. 37.15 + ? = 100
  38. 38.47 + ? = 100
  39. 39.14 + ? = 100
  40. 40.32 + ? = 100

Answer key

  1. 3
  2. 4
  3. 87
  4. 14
  5. 29
  6. 1
  7. 58
  8. 8
  9. 51
  10. 31
  11. 6
  12. 9
  13. 20
  14. 7
  15. 82
  16. 5
  17. 46
  18. 77
  19. 47
  20. 50
  21. 48
  22. 84
  23. 38
  24. 59
  25. 75
  26. 18
  27. 21
  28. 67
  29. 2
  30. 52
  31. 56
  32. 12
  33. 63
  34. 24
  35. 27
  36. 62
  37. 85
  38. 53
  39. 86
  40. 68

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