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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 213 · 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. 1.35 + ? = 100
  2. 2.6 + ? = 10
  3. 3.5 + ? = 10
  4. 4.2 + ? = 10
  5. 5.7 + ? = 10
  6. 6.9 + ? = 10
  7. 7.32 + ? = 100
  8. 8.8 + ? = 10
  9. 9.49 + ? = 100
  10. 10.44 + ? = 100
  11. 11.72 + ? = 100
  12. 12.1 + ? = 10
  13. 13.30 + ? = 100
  14. 14.75 + ? = 100
  15. 15.71 + ? = 100
  16. 16.22 + ? = 100
  17. 17.16 + ? = 100
  18. 18.23 + ? = 100
  19. 19.68 + ? = 100
  20. 20.15 + ? = 100
  21. 21.87 + ? = 100
  22. 22.12 + ? = 100
  23. 23.56 + ? = 100
  24. 24.4 + ? = 10
  25. 25.59 + ? = 100
  26. 26.3 + ? = 10
  27. 27.58 + ? = 100
  28. 28.34 + ? = 100
  29. 29.28 + ? = 100
  30. 30.81 + ? = 100
  31. 31.73 + ? = 100
  32. 32.37 + ? = 100
  33. 33.14 + ? = 100
  34. 34.55 + ? = 100
  35. 35.48 + ? = 100
  36. 36.82 + ? = 100
  37. 37.52 + ? = 100
  38. 38.11 + ? = 100
  39. 39.47 + ? = 100
  40. 40.77 + ? = 100

Answer key

  1. 65
  2. 4
  3. 5
  4. 8
  5. 3
  6. 1
  7. 68
  8. 2
  9. 51
  10. 56
  11. 28
  12. 9
  13. 70
  14. 25
  15. 29
  16. 78
  17. 84
  18. 77
  19. 32
  20. 85
  21. 13
  22. 88
  23. 44
  24. 6
  25. 41
  26. 7
  27. 42
  28. 66
  29. 72
  30. 19
  31. 27
  32. 63
  33. 86
  34. 45
  35. 52
  36. 18
  37. 48
  38. 89
  39. 53
  40. 23

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