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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 70 · 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. 1.25 + ? = 100
  2. 2.6 + ? = 10
  3. 3.1 + ? = 10
  4. 4.7 + ? = 10
  5. 5.83 + ? = 100
  6. 6.79 + ? = 100
  7. 7.4 + ? = 10
  8. 8.45 + ? = 100
  9. 9.9 + ? = 10
  10. 10.8 + ? = 10
  11. 11.63 + ? = 100
  12. 12.55 + ? = 100
  13. 13.32 + ? = 100
  14. 14.3 + ? = 10
  15. 15.5 + ? = 10
  16. 16.59 + ? = 100
  17. 17.84 + ? = 100
  18. 18.18 + ? = 100
  19. 19.20 + ? = 100
  20. 20.86 + ? = 100
  21. 21.16 + ? = 100
  22. 22.34 + ? = 100
  23. 23.46 + ? = 100
  24. 24.70 + ? = 100
  25. 25.2 + ? = 10
  26. 26.58 + ? = 100
  27. 27.78 + ? = 100
  28. 28.61 + ? = 100
  29. 29.28 + ? = 100
  30. 30.76 + ? = 100
  31. 31.87 + ? = 100
  32. 32.24 + ? = 100
  33. 33.69 + ? = 100
  34. 34.75 + ? = 100
  35. 35.73 + ? = 100
  36. 36.22 + ? = 100
  37. 37.14 + ? = 100
  38. 38.50 + ? = 100
  39. 39.88 + ? = 100
  40. 40.41 + ? = 100

Answer key

  1. 75
  2. 4
  3. 9
  4. 3
  5. 17
  6. 21
  7. 6
  8. 55
  9. 1
  10. 2
  11. 37
  12. 45
  13. 68
  14. 7
  15. 5
  16. 41
  17. 16
  18. 82
  19. 80
  20. 14
  21. 84
  22. 66
  23. 54
  24. 30
  25. 8
  26. 42
  27. 22
  28. 39
  29. 72
  30. 24
  31. 13
  32. 76
  33. 31
  34. 25
  35. 27
  36. 78
  37. 86
  38. 50
  39. 12
  40. 59

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