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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 484 · 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. 1.4 + ? = 10
  2. 2.51 + ? = 100
  3. 3.19 + ? = 100
  4. 4.78 + ? = 100
  5. 5.14 + ? = 100
  6. 6.49 + ? = 100
  7. 7.29 + ? = 100
  8. 8.5 + ? = 10
  9. 9.62 + ? = 100
  10. 10.21 + ? = 100
  11. 11.33 + ? = 100
  12. 12.6 + ? = 10
  13. 13.34 + ? = 100
  14. 14.8 + ? = 10
  15. 15.3 + ? = 10
  16. 16.2 + ? = 10
  17. 17.63 + ? = 100
  18. 18.54 + ? = 100
  19. 19.46 + ? = 100
  20. 20.25 + ? = 100
  21. 21.65 + ? = 100
  22. 22.85 + ? = 100
  23. 23.40 + ? = 100
  24. 24.48 + ? = 100
  25. 25.74 + ? = 100
  26. 26.18 + ? = 100
  27. 27.1 + ? = 10
  28. 28.38 + ? = 100
  29. 29.11 + ? = 100
  30. 30.55 + ? = 100
  31. 31.15 + ? = 100
  32. 32.58 + ? = 100
  33. 33.23 + ? = 100
  34. 34.13 + ? = 100
  35. 35.75 + ? = 100
  36. 36.69 + ? = 100
  37. 37.12 + ? = 100
  38. 38.79 + ? = 100
  39. 39.87 + ? = 100
  40. 40.32 + ? = 100

Answer key

  1. 6
  2. 49
  3. 81
  4. 22
  5. 86
  6. 51
  7. 71
  8. 5
  9. 38
  10. 79
  11. 67
  12. 4
  13. 66
  14. 2
  15. 7
  16. 8
  17. 37
  18. 46
  19. 54
  20. 75
  21. 35
  22. 15
  23. 60
  24. 52
  25. 26
  26. 82
  27. 9
  28. 62
  29. 89
  30. 45
  31. 85
  32. 42
  33. 77
  34. 87
  35. 25
  36. 31
  37. 88
  38. 21
  39. 13
  40. 68

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