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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 120 · 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. 1.2 + ? = 10
  2. 2.24 + ? = 100
  3. 3.6 + ? = 10
  4. 4.1 + ? = 10
  5. 5.47 + ? = 100
  6. 6.3 + ? = 10
  7. 7.64 + ? = 100
  8. 8.26 + ? = 100
  9. 9.72 + ? = 100
  10. 10.9 + ? = 10
  11. 11.46 + ? = 100
  12. 12.7 + ? = 10
  13. 13.5 + ? = 10
  14. 14.4 + ? = 10
  15. 15.73 + ? = 100
  16. 16.48 + ? = 100
  17. 17.53 + ? = 100
  18. 18.35 + ? = 100
  19. 19.69 + ? = 100
  20. 20.19 + ? = 100
  21. 21.57 + ? = 100
  22. 22.77 + ? = 100
  23. 23.27 + ? = 100
  24. 24.8 + ? = 10
  25. 25.20 + ? = 100
  26. 26.63 + ? = 100
  27. 27.37 + ? = 100
  28. 28.44 + ? = 100
  29. 29.84 + ? = 100
  30. 30.23 + ? = 100
  31. 31.15 + ? = 100
  32. 32.56 + ? = 100
  33. 33.36 + ? = 100
  34. 34.13 + ? = 100
  35. 35.60 + ? = 100
  36. 36.82 + ? = 100
  37. 37.43 + ? = 100
  38. 38.33 + ? = 100
  39. 39.25 + ? = 100
  40. 40.52 + ? = 100

Answer key

  1. 8
  2. 76
  3. 4
  4. 9
  5. 53
  6. 7
  7. 36
  8. 74
  9. 28
  10. 1
  11. 54
  12. 3
  13. 5
  14. 6
  15. 27
  16. 52
  17. 47
  18. 65
  19. 31
  20. 81
  21. 43
  22. 23
  23. 73
  24. 2
  25. 80
  26. 37
  27. 63
  28. 56
  29. 16
  30. 77
  31. 85
  32. 44
  33. 64
  34. 87
  35. 40
  36. 18
  37. 57
  38. 67
  39. 75
  40. 48

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