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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 304 · 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. 1.5 + ? = 10
  2. 2.4 + ? = 10
  3. 3.85 + ? = 100
  4. 4.2 + ? = 10
  5. 5.8 + ? = 10
  6. 6.28 + ? = 100
  7. 7.9 + ? = 10
  8. 8.89 + ? = 100
  9. 9.45 + ? = 100
  10. 10.3 + ? = 10
  11. 11.1 + ? = 10
  12. 12.67 + ? = 100
  13. 13.53 + ? = 100
  14. 14.7 + ? = 10
  15. 15.88 + ? = 100
  16. 16.49 + ? = 100
  17. 17.21 + ? = 100
  18. 18.58 + ? = 100
  19. 19.79 + ? = 100
  20. 20.19 + ? = 100
  21. 21.56 + ? = 100
  22. 22.17 + ? = 100
  23. 23.77 + ? = 100
  24. 24.6 + ? = 10
  25. 25.73 + ? = 100
  26. 26.20 + ? = 100
  27. 27.78 + ? = 100
  28. 28.39 + ? = 100
  29. 29.74 + ? = 100
  30. 30.69 + ? = 100
  31. 31.52 + ? = 100
  32. 32.66 + ? = 100
  33. 33.70 + ? = 100
  34. 34.14 + ? = 100
  35. 35.18 + ? = 100
  36. 36.40 + ? = 100
  37. 37.68 + ? = 100
  38. 38.35 + ? = 100
  39. 39.62 + ? = 100
  40. 40.76 + ? = 100

Answer key

  1. 5
  2. 6
  3. 15
  4. 8
  5. 2
  6. 72
  7. 1
  8. 11
  9. 55
  10. 7
  11. 9
  12. 33
  13. 47
  14. 3
  15. 12
  16. 51
  17. 79
  18. 42
  19. 21
  20. 81
  21. 44
  22. 83
  23. 23
  24. 4
  25. 27
  26. 80
  27. 22
  28. 61
  29. 26
  30. 31
  31. 48
  32. 34
  33. 30
  34. 86
  35. 82
  36. 60
  37. 32
  38. 65
  39. 38
  40. 24

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