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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 573 · 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. 2.7 + ? = 10
  3. 3.5 + ? = 10
  4. 4.46 + ? = 100
  5. 5.54 + ? = 100
  6. 6.6 + ? = 10
  7. 7.22 + ? = 100
  8. 8.61 + ? = 100
  9. 9.89 + ? = 100
  10. 10.51 + ? = 100
  11. 11.36 + ? = 100
  12. 12.48 + ? = 100
  13. 13.30 + ? = 100
  14. 14.26 + ? = 100
  15. 15.32 + ? = 100
  16. 16.9 + ? = 10
  17. 17.8 + ? = 10
  18. 18.3 + ? = 10
  19. 19.17 + ? = 100
  20. 20.71 + ? = 100
  21. 21.67 + ? = 100
  22. 22.80 + ? = 100
  23. 23.4 + ? = 10
  24. 24.38 + ? = 100
  25. 25.15 + ? = 100
  26. 26.62 + ? = 100
  27. 27.82 + ? = 100
  28. 28.19 + ? = 100
  29. 29.12 + ? = 100
  30. 30.52 + ? = 100
  31. 31.56 + ? = 100
  32. 32.25 + ? = 100
  33. 33.1 + ? = 10
  34. 34.78 + ? = 100
  35. 35.13 + ? = 100
  36. 36.58 + ? = 100
  37. 37.28 + ? = 100
  38. 38.45 + ? = 100
  39. 39.86 + ? = 100
  40. 40.79 + ? = 100

Answer key

  1. 8
  2. 3
  3. 5
  4. 54
  5. 46
  6. 4
  7. 78
  8. 39
  9. 11
  10. 49
  11. 64
  12. 52
  13. 70
  14. 74
  15. 68
  16. 1
  17. 2
  18. 7
  19. 83
  20. 29
  21. 33
  22. 20
  23. 6
  24. 62
  25. 85
  26. 38
  27. 18
  28. 81
  29. 88
  30. 48
  31. 44
  32. 75
  33. 9
  34. 22
  35. 87
  36. 42
  37. 72
  38. 55
  39. 14
  40. 21

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