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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 150 · 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. 1.44 + ? = 100
  2. 2.62 + ? = 100
  3. 3.7 + ? = 10
  4. 4.84 + ? = 100
  5. 5.14 + ? = 100
  6. 6.61 + ? = 100
  7. 7.53 + ? = 100
  8. 8.4 + ? = 10
  9. 9.2 + ? = 10
  10. 10.9 + ? = 10
  11. 11.34 + ? = 100
  12. 12.77 + ? = 100
  13. 13.47 + ? = 100
  14. 14.48 + ? = 100
  15. 15.12 + ? = 100
  16. 16.18 + ? = 100
  17. 17.67 + ? = 100
  18. 18.8 + ? = 10
  19. 19.3 + ? = 10
  20. 20.28 + ? = 100
  21. 21.85 + ? = 100
  22. 22.22 + ? = 100
  23. 23.59 + ? = 100
  24. 24.49 + ? = 100
  25. 25.24 + ? = 100
  26. 26.20 + ? = 100
  27. 27.23 + ? = 100
  28. 28.39 + ? = 100
  29. 29.76 + ? = 100
  30. 30.35 + ? = 100
  31. 31.75 + ? = 100
  32. 32.27 + ? = 100
  33. 33.74 + ? = 100
  34. 34.41 + ? = 100
  35. 35.69 + ? = 100
  36. 36.78 + ? = 100
  37. 37.73 + ? = 100
  38. 38.6 + ? = 10
  39. 39.1 + ? = 10
  40. 40.51 + ? = 100

Answer key

  1. 56
  2. 38
  3. 3
  4. 16
  5. 86
  6. 39
  7. 47
  8. 6
  9. 8
  10. 1
  11. 66
  12. 23
  13. 53
  14. 52
  15. 88
  16. 82
  17. 33
  18. 2
  19. 7
  20. 72
  21. 15
  22. 78
  23. 41
  24. 51
  25. 76
  26. 80
  27. 77
  28. 61
  29. 24
  30. 65
  31. 25
  32. 73
  33. 26
  34. 59
  35. 31
  36. 22
  37. 27
  38. 4
  39. 9
  40. 49

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