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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 27 · 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. 2.1 + ? = 10
  3. 3.53 + ? = 100
  4. 4.6 + ? = 10
  5. 5.29 + ? = 100
  6. 6.28 + ? = 100
  7. 7.2 + ? = 10
  8. 8.66 + ? = 100
  9. 9.42 + ? = 100
  10. 10.3 + ? = 10
  11. 11.17 + ? = 100
  12. 12.8 + ? = 10
  13. 13.50 + ? = 100
  14. 14.7 + ? = 10
  15. 15.22 + ? = 100
  16. 16.78 + ? = 100
  17. 17.21 + ? = 100
  18. 18.67 + ? = 100
  19. 19.79 + ? = 100
  20. 20.19 + ? = 100
  21. 21.32 + ? = 100
  22. 22.12 + ? = 100
  23. 23.62 + ? = 100
  24. 24.69 + ? = 100
  25. 25.65 + ? = 100
  26. 26.45 + ? = 100
  27. 27.38 + ? = 100
  28. 28.84 + ? = 100
  29. 29.5 + ? = 10
  30. 30.72 + ? = 100
  31. 31.75 + ? = 100
  32. 32.11 + ? = 100
  33. 33.77 + ? = 100
  34. 34.18 + ? = 100
  35. 35.54 + ? = 100
  36. 36.34 + ? = 100
  37. 37.33 + ? = 100
  38. 38.36 + ? = 100
  39. 39.4 + ? = 10
  40. 40.20 + ? = 100

Answer key

  1. 1
  2. 9
  3. 47
  4. 4
  5. 71
  6. 72
  7. 8
  8. 34
  9. 58
  10. 7
  11. 83
  12. 2
  13. 50
  14. 3
  15. 78
  16. 22
  17. 79
  18. 33
  19. 21
  20. 81
  21. 68
  22. 88
  23. 38
  24. 31
  25. 35
  26. 55
  27. 62
  28. 16
  29. 5
  30. 28
  31. 25
  32. 89
  33. 23
  34. 82
  35. 46
  36. 66
  37. 67
  38. 64
  39. 6
  40. 80

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