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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 50 · 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. 1.34 + ? = 100
  2. 2.32 + ? = 100
  3. 3.15 + ? = 100
  4. 4.8 + ? = 10
  5. 5.3 + ? = 10
  6. 6.54 + ? = 100
  7. 7.2 + ? = 10
  8. 8.1 + ? = 10
  9. 9.85 + ? = 100
  10. 10.73 + ? = 100
  11. 11.6 + ? = 10
  12. 12.14 + ? = 100
  13. 13.40 + ? = 100
  14. 14.21 + ? = 100
  15. 15.88 + ? = 100
  16. 16.4 + ? = 10
  17. 17.7 + ? = 10
  18. 18.49 + ? = 100
  19. 19.30 + ? = 100
  20. 20.29 + ? = 100
  21. 21.5 + ? = 10
  22. 22.65 + ? = 100
  23. 23.51 + ? = 100
  24. 24.22 + ? = 100
  25. 25.64 + ? = 100
  26. 26.56 + ? = 100
  27. 27.83 + ? = 100
  28. 28.33 + ? = 100
  29. 29.89 + ? = 100
  30. 30.36 + ? = 100
  31. 31.20 + ? = 100
  32. 32.25 + ? = 100
  33. 33.43 + ? = 100
  34. 34.9 + ? = 10
  35. 35.63 + ? = 100
  36. 36.24 + ? = 100
  37. 37.50 + ? = 100
  38. 38.76 + ? = 100
  39. 39.69 + ? = 100
  40. 40.45 + ? = 100

Answer key

  1. 66
  2. 68
  3. 85
  4. 2
  5. 7
  6. 46
  7. 8
  8. 9
  9. 15
  10. 27
  11. 4
  12. 86
  13. 60
  14. 79
  15. 12
  16. 6
  17. 3
  18. 51
  19. 70
  20. 71
  21. 5
  22. 35
  23. 49
  24. 78
  25. 36
  26. 44
  27. 17
  28. 67
  29. 11
  30. 64
  31. 80
  32. 75
  33. 57
  34. 1
  35. 37
  36. 76
  37. 50
  38. 24
  39. 31
  40. 55

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