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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 217 · 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. 2.6 + ? = 10
  3. 3.53 + ? = 100
  4. 4.35 + ? = 100
  5. 5.1 + ? = 10
  6. 6.4 + ? = 10
  7. 7.2 + ? = 10
  8. 8.5 + ? = 10
  9. 9.7 + ? = 10
  10. 10.30 + ? = 100
  11. 11.38 + ? = 100
  12. 12.65 + ? = 100
  13. 13.64 + ? = 100
  14. 14.33 + ? = 100
  15. 15.81 + ? = 100
  16. 16.23 + ? = 100
  17. 17.41 + ? = 100
  18. 18.45 + ? = 100
  19. 19.73 + ? = 100
  20. 20.29 + ? = 100
  21. 21.37 + ? = 100
  22. 22.3 + ? = 10
  23. 23.87 + ? = 100
  24. 24.8 + ? = 10
  25. 25.17 + ? = 100
  26. 26.49 + ? = 100
  27. 27.67 + ? = 100
  28. 28.11 + ? = 100
  29. 29.46 + ? = 100
  30. 30.19 + ? = 100
  31. 31.51 + ? = 100
  32. 32.55 + ? = 100
  33. 33.72 + ? = 100
  34. 34.83 + ? = 100
  35. 35.30 + ? = 100
  36. 36.24 + ? = 100
  37. 37.22 + ? = 100
  38. 38.59 + ? = 100
  39. 39.16 + ? = 100
  40. 40.20 + ? = 100

Answer key

  1. 1
  2. 4
  3. 47
  4. 65
  5. 9
  6. 6
  7. 8
  8. 5
  9. 3
  10. 70
  11. 62
  12. 35
  13. 36
  14. 67
  15. 19
  16. 77
  17. 59
  18. 55
  19. 27
  20. 71
  21. 63
  22. 7
  23. 13
  24. 2
  25. 83
  26. 51
  27. 33
  28. 89
  29. 54
  30. 81
  31. 49
  32. 45
  33. 28
  34. 17
  35. 70
  36. 76
  37. 78
  38. 41
  39. 84
  40. 80

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