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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 689 · 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. 1.8 + ? = 10
  2. 2.89 + ? = 100
  3. 3.2 + ? = 10
  4. 4.15 + ? = 100
  5. 5.6 + ? = 10
  6. 6.76 + ? = 100
  7. 7.68 + ? = 100
  8. 8.1 + ? = 10
  9. 9.4 + ? = 10
  10. 10.22 + ? = 100
  11. 11.46 + ? = 100
  12. 12.5 + ? = 10
  13. 13.30 + ? = 100
  14. 14.19 + ? = 100
  15. 15.73 + ? = 100
  16. 16.25 + ? = 100
  17. 17.16 + ? = 100
  18. 18.3 + ? = 10
  19. 19.40 + ? = 100
  20. 20.75 + ? = 100
  21. 21.9 + ? = 10
  22. 22.64 + ? = 100
  23. 23.36 + ? = 100
  24. 24.88 + ? = 100
  25. 25.79 + ? = 100
  26. 26.82 + ? = 100
  27. 27.50 + ? = 100
  28. 28.57 + ? = 100
  29. 29.29 + ? = 100
  30. 30.87 + ? = 100
  31. 31.11 + ? = 100
  32. 32.12 + ? = 100
  33. 33.62 + ? = 100
  34. 34.28 + ? = 100
  35. 35.18 + ? = 100
  36. 36.32 + ? = 100
  37. 37.53 + ? = 100
  38. 38.21 + ? = 100
  39. 39.49 + ? = 100
  40. 40.26 + ? = 100

Answer key

  1. 2
  2. 11
  3. 8
  4. 85
  5. 4
  6. 24
  7. 32
  8. 9
  9. 6
  10. 78
  11. 54
  12. 5
  13. 70
  14. 81
  15. 27
  16. 75
  17. 84
  18. 7
  19. 60
  20. 25
  21. 1
  22. 36
  23. 64
  24. 12
  25. 21
  26. 18
  27. 50
  28. 43
  29. 71
  30. 13
  31. 89
  32. 88
  33. 38
  34. 72
  35. 82
  36. 68
  37. 47
  38. 79
  39. 51
  40. 74

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