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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 521 · 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. 1.47 + ? = 100
  2. 2.61 + ? = 100
  3. 3.9 + ? = 10
  4. 4.7 + ? = 10
  5. 5.4 + ? = 10
  6. 6.80 + ? = 100
  7. 7.8 + ? = 10
  8. 8.14 + ? = 100
  9. 9.15 + ? = 100
  10. 10.5 + ? = 10
  11. 11.1 + ? = 10
  12. 12.6 + ? = 10
  13. 13.3 + ? = 10
  14. 14.83 + ? = 100
  15. 15.44 + ? = 100
  16. 16.67 + ? = 100
  17. 17.41 + ? = 100
  18. 18.30 + ? = 100
  19. 19.75 + ? = 100
  20. 20.50 + ? = 100
  21. 21.26 + ? = 100
  22. 22.2 + ? = 10
  23. 23.36 + ? = 100
  24. 24.48 + ? = 100
  25. 25.12 + ? = 100
  26. 26.78 + ? = 100
  27. 27.38 + ? = 100
  28. 28.45 + ? = 100
  29. 29.65 + ? = 100
  30. 30.39 + ? = 100
  31. 31.53 + ? = 100
  32. 32.89 + ? = 100
  33. 33.52 + ? = 100
  34. 34.82 + ? = 100
  35. 35.49 + ? = 100
  36. 36.24 + ? = 100
  37. 37.18 + ? = 100
  38. 38.34 + ? = 100
  39. 39.73 + ? = 100
  40. 40.17 + ? = 100

Answer key

  1. 53
  2. 39
  3. 1
  4. 3
  5. 6
  6. 20
  7. 2
  8. 86
  9. 85
  10. 5
  11. 9
  12. 4
  13. 7
  14. 17
  15. 56
  16. 33
  17. 59
  18. 70
  19. 25
  20. 50
  21. 74
  22. 8
  23. 64
  24. 52
  25. 88
  26. 22
  27. 62
  28. 55
  29. 35
  30. 61
  31. 47
  32. 11
  33. 48
  34. 18
  35. 51
  36. 76
  37. 82
  38. 66
  39. 27
  40. 83

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