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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 348 · 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. 1.83 + ? = 100
  2. 2.73 + ? = 100
  3. 3.55 + ? = 100
  4. 4.82 + ? = 100
  5. 5.3 + ? = 10
  6. 6.60 + ? = 100
  7. 7.46 + ? = 100
  8. 8.2 + ? = 10
  9. 9.7 + ? = 10
  10. 10.80 + ? = 100
  11. 11.87 + ? = 100
  12. 12.8 + ? = 10
  13. 13.4 + ? = 10
  14. 14.1 + ? = 10
  15. 15.78 + ? = 100
  16. 16.6 + ? = 10
  17. 17.64 + ? = 100
  18. 18.30 + ? = 100
  19. 19.20 + ? = 100
  20. 20.88 + ? = 100
  21. 21.36 + ? = 100
  22. 22.67 + ? = 100
  23. 23.5 + ? = 10
  24. 24.17 + ? = 100
  25. 25.56 + ? = 100
  26. 26.37 + ? = 100
  27. 27.9 + ? = 10
  28. 28.33 + ? = 100
  29. 29.34 + ? = 100
  30. 30.12 + ? = 100
  31. 31.86 + ? = 100
  32. 32.51 + ? = 100
  33. 33.74 + ? = 100
  34. 34.63 + ? = 100
  35. 35.84 + ? = 100
  36. 36.70 + ? = 100
  37. 37.15 + ? = 100
  38. 38.81 + ? = 100
  39. 39.13 + ? = 100
  40. 40.23 + ? = 100

Answer key

  1. 17
  2. 27
  3. 45
  4. 18
  5. 7
  6. 40
  7. 54
  8. 8
  9. 3
  10. 20
  11. 13
  12. 2
  13. 6
  14. 9
  15. 22
  16. 4
  17. 36
  18. 70
  19. 80
  20. 12
  21. 64
  22. 33
  23. 5
  24. 83
  25. 44
  26. 63
  27. 1
  28. 67
  29. 66
  30. 88
  31. 14
  32. 49
  33. 26
  34. 37
  35. 16
  36. 30
  37. 85
  38. 19
  39. 87
  40. 77

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