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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 15 · 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. 1.85 + ? = 100
  2. 2.55 + ? = 100
  3. 3.29 + ? = 100
  4. 4.2 + ? = 10
  5. 5.56 + ? = 100
  6. 6.9 + ? = 10
  7. 7.4 + ? = 10
  8. 8.19 + ? = 100
  9. 9.54 + ? = 100
  10. 10.35 + ? = 100
  11. 11.8 + ? = 10
  12. 12.41 + ? = 100
  13. 13.6 + ? = 10
  14. 14.25 + ? = 100
  15. 15.1 + ? = 10
  16. 16.28 + ? = 100
  17. 17.3 + ? = 10
  18. 18.74 + ? = 100
  19. 19.71 + ? = 100
  20. 20.7 + ? = 10
  21. 21.14 + ? = 100
  22. 22.50 + ? = 100
  23. 23.53 + ? = 100
  24. 24.77 + ? = 100
  25. 25.87 + ? = 100
  26. 26.82 + ? = 100
  27. 27.75 + ? = 100
  28. 28.5 + ? = 10
  29. 29.70 + ? = 100
  30. 30.23 + ? = 100
  31. 31.60 + ? = 100
  32. 32.22 + ? = 100
  33. 33.44 + ? = 100
  34. 34.80 + ? = 100
  35. 35.30 + ? = 100
  36. 36.59 + ? = 100
  37. 37.26 + ? = 100
  38. 38.24 + ? = 100
  39. 39.11 + ? = 100
  40. 40.64 + ? = 100

Answer key

  1. 15
  2. 45
  3. 71
  4. 8
  5. 44
  6. 1
  7. 6
  8. 81
  9. 46
  10. 65
  11. 2
  12. 59
  13. 4
  14. 75
  15. 9
  16. 72
  17. 7
  18. 26
  19. 29
  20. 3
  21. 86
  22. 50
  23. 47
  24. 23
  25. 13
  26. 18
  27. 25
  28. 5
  29. 30
  30. 77
  31. 40
  32. 78
  33. 56
  34. 20
  35. 70
  36. 41
  37. 74
  38. 76
  39. 89
  40. 36

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