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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 34 · 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. 3.21 + ? = 100
  4. 4.8 + ? = 10
  5. 5.9 + ? = 10
  6. 6.52 + ? = 100
  7. 7.54 + ? = 100
  8. 8.53 + ? = 100
  9. 9.3 + ? = 10
  10. 10.59 + ? = 100
  11. 11.1 + ? = 10
  12. 12.20 + ? = 100
  13. 13.37 + ? = 100
  14. 14.83 + ? = 100
  15. 15.60 + ? = 100
  16. 16.4 + ? = 10
  17. 17.38 + ? = 100
  18. 18.55 + ? = 100
  19. 19.34 + ? = 100
  20. 20.57 + ? = 100
  21. 21.62 + ? = 100
  22. 22.16 + ? = 100
  23. 23.69 + ? = 100
  24. 24.2 + ? = 10
  25. 25.25 + ? = 100
  26. 26.44 + ? = 100
  27. 27.51 + ? = 100
  28. 28.12 + ? = 100
  29. 29.75 + ? = 100
  30. 30.86 + ? = 100
  31. 31.35 + ? = 100
  32. 32.41 + ? = 100
  33. 33.31 + ? = 100
  34. 34.22 + ? = 100
  35. 35.65 + ? = 100
  36. 36.6 + ? = 10
  37. 37.45 + ? = 100
  38. 38.28 + ? = 100
  39. 39.32 + ? = 100
  40. 40.66 + ? = 100

Answer key

  1. 5
  2. 3
  3. 79
  4. 2
  5. 1
  6. 48
  7. 46
  8. 47
  9. 7
  10. 41
  11. 9
  12. 80
  13. 63
  14. 17
  15. 40
  16. 6
  17. 62
  18. 45
  19. 66
  20. 43
  21. 38
  22. 84
  23. 31
  24. 8
  25. 75
  26. 56
  27. 49
  28. 88
  29. 25
  30. 14
  31. 65
  32. 59
  33. 69
  34. 78
  35. 35
  36. 4
  37. 55
  38. 72
  39. 68
  40. 34

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