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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 114 · 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. 2.79 + ? = 100
  3. 3.8 + ? = 10
  4. 4.5 + ? = 10
  5. 5.2 + ? = 10
  6. 6.74 + ? = 100
  7. 7.34 + ? = 100
  8. 8.25 + ? = 100
  9. 9.64 + ? = 100
  10. 10.1 + ? = 10
  11. 11.62 + ? = 100
  12. 12.9 + ? = 10
  13. 13.33 + ? = 100
  14. 14.4 + ? = 10
  15. 15.6 + ? = 10
  16. 16.77 + ? = 100
  17. 17.28 + ? = 100
  18. 18.3 + ? = 10
  19. 19.37 + ? = 100
  20. 20.18 + ? = 100
  21. 21.80 + ? = 100
  22. 22.32 + ? = 100
  23. 23.26 + ? = 100
  24. 24.83 + ? = 100
  25. 25.31 + ? = 100
  26. 26.24 + ? = 100
  27. 27.35 + ? = 100
  28. 28.49 + ? = 100
  29. 29.56 + ? = 100
  30. 30.45 + ? = 100
  31. 31.76 + ? = 100
  32. 32.73 + ? = 100
  33. 33.22 + ? = 100
  34. 34.48 + ? = 100
  35. 35.42 + ? = 100
  36. 36.72 + ? = 100
  37. 37.13 + ? = 100
  38. 38.60 + ? = 100
  39. 39.50 + ? = 100
  40. 40.15 + ? = 100

Answer key

  1. 3
  2. 21
  3. 2
  4. 5
  5. 8
  6. 26
  7. 66
  8. 75
  9. 36
  10. 9
  11. 38
  12. 1
  13. 67
  14. 6
  15. 4
  16. 23
  17. 72
  18. 7
  19. 63
  20. 82
  21. 20
  22. 68
  23. 74
  24. 17
  25. 69
  26. 76
  27. 65
  28. 51
  29. 44
  30. 55
  31. 24
  32. 27
  33. 78
  34. 52
  35. 58
  36. 28
  37. 87
  38. 40
  39. 50
  40. 85

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