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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 618 · 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. 1.5 + ? = 10
  2. 2.7 + ? = 10
  3. 3.8 + ? = 10
  4. 4.88 + ? = 100
  5. 5.2 + ? = 10
  6. 6.36 + ? = 100
  7. 7.1 + ? = 10
  8. 8.6 + ? = 10
  9. 9.63 + ? = 100
  10. 10.64 + ? = 100
  11. 11.59 + ? = 100
  12. 12.25 + ? = 100
  13. 13.9 + ? = 10
  14. 14.3 + ? = 10
  15. 15.55 + ? = 100
  16. 16.71 + ? = 100
  17. 17.48 + ? = 100
  18. 18.4 + ? = 10
  19. 19.23 + ? = 100
  20. 20.43 + ? = 100
  21. 21.76 + ? = 100
  22. 22.33 + ? = 100
  23. 23.54 + ? = 100
  24. 24.22 + ? = 100
  25. 25.14 + ? = 100
  26. 26.18 + ? = 100
  27. 27.26 + ? = 100
  28. 28.21 + ? = 100
  29. 29.85 + ? = 100
  30. 30.61 + ? = 100
  31. 31.62 + ? = 100
  32. 32.35 + ? = 100
  33. 33.65 + ? = 100
  34. 34.46 + ? = 100
  35. 35.84 + ? = 100
  36. 36.40 + ? = 100
  37. 37.67 + ? = 100
  38. 38.20 + ? = 100
  39. 39.19 + ? = 100
  40. 40.37 + ? = 100

Answer key

  1. 5
  2. 3
  3. 2
  4. 12
  5. 8
  6. 64
  7. 9
  8. 4
  9. 37
  10. 36
  11. 41
  12. 75
  13. 1
  14. 7
  15. 45
  16. 29
  17. 52
  18. 6
  19. 77
  20. 57
  21. 24
  22. 67
  23. 46
  24. 78
  25. 86
  26. 82
  27. 74
  28. 79
  29. 15
  30. 39
  31. 38
  32. 65
  33. 35
  34. 54
  35. 16
  36. 60
  37. 33
  38. 80
  39. 81
  40. 63

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