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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 627 · 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. 1.1 + ? = 10
  2. 2.75 + ? = 100
  3. 3.34 + ? = 100
  4. 4.6 + ? = 10
  5. 5.9 + ? = 10
  6. 6.87 + ? = 100
  7. 7.42 + ? = 100
  8. 8.7 + ? = 10
  9. 9.5 + ? = 10
  10. 10.40 + ? = 100
  11. 11.73 + ? = 100
  12. 12.24 + ? = 100
  13. 13.20 + ? = 100
  14. 14.79 + ? = 100
  15. 15.8 + ? = 10
  16. 16.23 + ? = 100
  17. 17.27 + ? = 100
  18. 18.64 + ? = 100
  19. 19.12 + ? = 100
  20. 20.63 + ? = 100
  21. 21.78 + ? = 100
  22. 22.51 + ? = 100
  23. 23.3 + ? = 10
  24. 24.62 + ? = 100
  25. 25.56 + ? = 100
  26. 26.30 + ? = 100
  27. 27.43 + ? = 100
  28. 28.4 + ? = 10
  29. 29.70 + ? = 100
  30. 30.66 + ? = 100
  31. 31.44 + ? = 100
  32. 32.84 + ? = 100
  33. 33.54 + ? = 100
  34. 34.2 + ? = 10
  35. 35.60 + ? = 100
  36. 36.61 + ? = 100
  37. 37.50 + ? = 100
  38. 38.19 + ? = 100
  39. 39.31 + ? = 100
  40. 40.88 + ? = 100

Answer key

  1. 9
  2. 25
  3. 66
  4. 4
  5. 1
  6. 13
  7. 58
  8. 3
  9. 5
  10. 60
  11. 27
  12. 76
  13. 80
  14. 21
  15. 2
  16. 77
  17. 73
  18. 36
  19. 88
  20. 37
  21. 22
  22. 49
  23. 7
  24. 38
  25. 44
  26. 70
  27. 57
  28. 6
  29. 30
  30. 34
  31. 56
  32. 16
  33. 46
  34. 8
  35. 40
  36. 39
  37. 50
  38. 81
  39. 69
  40. 12

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