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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 377 · 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. 1.20 + ? = 100
  2. 2.59 + ? = 100
  3. 3.6 + ? = 10
  4. 4.85 + ? = 100
  5. 5.4 + ? = 10
  6. 6.3 + ? = 10
  7. 7.53 + ? = 100
  8. 8.87 + ? = 100
  9. 9.29 + ? = 100
  10. 10.30 + ? = 100
  11. 11.2 + ? = 10
  12. 12.18 + ? = 100
  13. 13.50 + ? = 100
  14. 14.5 + ? = 10
  15. 15.8 + ? = 10
  16. 16.60 + ? = 100
  17. 17.17 + ? = 100
  18. 18.7 + ? = 10
  19. 19.41 + ? = 100
  20. 20.1 + ? = 10
  21. 21.12 + ? = 100
  22. 22.67 + ? = 100
  23. 23.58 + ? = 100
  24. 24.52 + ? = 100
  25. 25.14 + ? = 100
  26. 26.45 + ? = 100
  27. 27.37 + ? = 100
  28. 28.70 + ? = 100
  29. 29.49 + ? = 100
  30. 30.47 + ? = 100
  31. 31.69 + ? = 100
  32. 32.61 + ? = 100
  33. 33.86 + ? = 100
  34. 34.34 + ? = 100
  35. 35.89 + ? = 100
  36. 36.48 + ? = 100
  37. 37.9 + ? = 10
  38. 38.13 + ? = 100
  39. 39.32 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 80
  2. 41
  3. 4
  4. 15
  5. 6
  6. 7
  7. 47
  8. 13
  9. 71
  10. 70
  11. 8
  12. 82
  13. 50
  14. 5
  15. 2
  16. 40
  17. 83
  18. 3
  19. 59
  20. 9
  21. 88
  22. 33
  23. 42
  24. 48
  25. 86
  26. 55
  27. 63
  28. 30
  29. 51
  30. 53
  31. 31
  32. 39
  33. 14
  34. 66
  35. 11
  36. 52
  37. 1
  38. 87
  39. 68
  40. 22

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