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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 617 · 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. 1.3 + ? = 10
  2. 2.1 + ? = 10
  3. 3.15 + ? = 100
  4. 4.60 + ? = 100
  5. 5.8 + ? = 10
  6. 6.22 + ? = 100
  7. 7.44 + ? = 100
  8. 8.30 + ? = 100
  9. 9.6 + ? = 10
  10. 10.21 + ? = 100
  11. 11.2 + ? = 10
  12. 12.35 + ? = 100
  13. 13.7 + ? = 10
  14. 14.57 + ? = 100
  15. 15.77 + ? = 100
  16. 16.37 + ? = 100
  17. 17.76 + ? = 100
  18. 18.9 + ? = 10
  19. 19.89 + ? = 100
  20. 20.70 + ? = 100
  21. 21.4 + ? = 10
  22. 22.36 + ? = 100
  23. 23.18 + ? = 100
  24. 24.49 + ? = 100
  25. 25.88 + ? = 100
  26. 26.16 + ? = 100
  27. 27.73 + ? = 100
  28. 28.43 + ? = 100
  29. 29.58 + ? = 100
  30. 30.47 + ? = 100
  31. 31.54 + ? = 100
  32. 32.20 + ? = 100
  33. 33.52 + ? = 100
  34. 34.5 + ? = 10
  35. 35.48 + ? = 100
  36. 36.56 + ? = 100
  37. 37.33 + ? = 100
  38. 38.72 + ? = 100
  39. 39.87 + ? = 100
  40. 40.85 + ? = 100

Answer key

  1. 7
  2. 9
  3. 85
  4. 40
  5. 2
  6. 78
  7. 56
  8. 70
  9. 4
  10. 79
  11. 8
  12. 65
  13. 3
  14. 43
  15. 23
  16. 63
  17. 24
  18. 1
  19. 11
  20. 30
  21. 6
  22. 64
  23. 82
  24. 51
  25. 12
  26. 84
  27. 27
  28. 57
  29. 42
  30. 53
  31. 46
  32. 80
  33. 48
  34. 5
  35. 52
  36. 44
  37. 67
  38. 28
  39. 13
  40. 15

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