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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 311 · 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. 1.7 + ? = 10
  2. 2.1 + ? = 10
  3. 3.9 + ? = 10
  4. 4.3 + ? = 10
  5. 5.83 + ? = 100
  6. 6.53 + ? = 100
  7. 7.51 + ? = 100
  8. 8.24 + ? = 100
  9. 9.49 + ? = 100
  10. 10.68 + ? = 100
  11. 11.30 + ? = 100
  12. 12.54 + ? = 100
  13. 13.5 + ? = 10
  14. 14.84 + ? = 100
  15. 15.82 + ? = 100
  16. 16.25 + ? = 100
  17. 17.75 + ? = 100
  18. 18.2 + ? = 10
  19. 19.16 + ? = 100
  20. 20.72 + ? = 100
  21. 21.31 + ? = 100
  22. 22.27 + ? = 100
  23. 23.89 + ? = 100
  24. 24.6 + ? = 10
  25. 25.74 + ? = 100
  26. 26.11 + ? = 100
  27. 27.17 + ? = 100
  28. 28.50 + ? = 100
  29. 29.69 + ? = 100
  30. 30.88 + ? = 100
  31. 31.21 + ? = 100
  32. 32.67 + ? = 100
  33. 33.43 + ? = 100
  34. 34.62 + ? = 100
  35. 35.4 + ? = 10
  36. 36.70 + ? = 100
  37. 37.8 + ? = 10
  38. 38.80 + ? = 100
  39. 39.44 + ? = 100
  40. 40.64 + ? = 100

Answer key

  1. 3
  2. 9
  3. 1
  4. 7
  5. 17
  6. 47
  7. 49
  8. 76
  9. 51
  10. 32
  11. 70
  12. 46
  13. 5
  14. 16
  15. 18
  16. 75
  17. 25
  18. 8
  19. 84
  20. 28
  21. 69
  22. 73
  23. 11
  24. 4
  25. 26
  26. 89
  27. 83
  28. 50
  29. 31
  30. 12
  31. 79
  32. 33
  33. 57
  34. 38
  35. 6
  36. 30
  37. 2
  38. 20
  39. 56
  40. 36

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