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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 270 · 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. 1.9 + ? = 10
  2. 2.30 + ? = 100
  3. 3.7 + ? = 10
  4. 4.11 + ? = 100
  5. 5.12 + ? = 100
  6. 6.55 + ? = 100
  7. 7.85 + ? = 100
  8. 8.74 + ? = 100
  9. 9.5 + ? = 10
  10. 10.34 + ? = 100
  11. 11.60 + ? = 100
  12. 12.73 + ? = 100
  13. 13.1 + ? = 10
  14. 14.42 + ? = 100
  15. 15.56 + ? = 100
  16. 16.62 + ? = 100
  17. 17.67 + ? = 100
  18. 18.8 + ? = 10
  19. 19.39 + ? = 100
  20. 20.4 + ? = 10
  21. 21.14 + ? = 100
  22. 22.53 + ? = 100
  23. 23.33 + ? = 100
  24. 24.28 + ? = 100
  25. 25.41 + ? = 100
  26. 26.6 + ? = 10
  27. 27.87 + ? = 100
  28. 28.50 + ? = 100
  29. 29.79 + ? = 100
  30. 30.2 + ? = 10
  31. 31.38 + ? = 100
  32. 32.43 + ? = 100
  33. 33.84 + ? = 100
  34. 34.64 + ? = 100
  35. 35.31 + ? = 100
  36. 36.29 + ? = 100
  37. 37.58 + ? = 100
  38. 38.20 + ? = 100
  39. 39.77 + ? = 100
  40. 40.66 + ? = 100

Answer key

  1. 1
  2. 70
  3. 3
  4. 89
  5. 88
  6. 45
  7. 15
  8. 26
  9. 5
  10. 66
  11. 40
  12. 27
  13. 9
  14. 58
  15. 44
  16. 38
  17. 33
  18. 2
  19. 61
  20. 6
  21. 86
  22. 47
  23. 67
  24. 72
  25. 59
  26. 4
  27. 13
  28. 50
  29. 21
  30. 8
  31. 62
  32. 57
  33. 16
  34. 36
  35. 69
  36. 71
  37. 42
  38. 80
  39. 23
  40. 34

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