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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 356 · 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. 1.5 + ? = 10
  2. 2.8 + ? = 10
  3. 3.79 + ? = 100
  4. 4.86 + ? = 100
  5. 5.20 + ? = 100
  6. 6.33 + ? = 100
  7. 7.2 + ? = 10
  8. 8.21 + ? = 100
  9. 9.39 + ? = 100
  10. 10.4 + ? = 10
  11. 11.37 + ? = 100
  12. 12.24 + ? = 100
  13. 13.6 + ? = 10
  14. 14.31 + ? = 100
  15. 15.3 + ? = 10
  16. 16.30 + ? = 100
  17. 17.38 + ? = 100
  18. 18.81 + ? = 100
  19. 19.76 + ? = 100
  20. 20.77 + ? = 100
  21. 21.53 + ? = 100
  22. 22.67 + ? = 100
  23. 23.85 + ? = 100
  24. 24.9 + ? = 10
  25. 25.54 + ? = 100
  26. 26.68 + ? = 100
  27. 27.52 + ? = 100
  28. 28.17 + ? = 100
  29. 29.26 + ? = 100
  30. 30.12 + ? = 100
  31. 31.50 + ? = 100
  32. 32.11 + ? = 100
  33. 33.58 + ? = 100
  34. 34.28 + ? = 100
  35. 35.51 + ? = 100
  36. 36.22 + ? = 100
  37. 37.72 + ? = 100
  38. 38.7 + ? = 10
  39. 39.60 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 5
  2. 2
  3. 21
  4. 14
  5. 80
  6. 67
  7. 8
  8. 79
  9. 61
  10. 6
  11. 63
  12. 76
  13. 4
  14. 69
  15. 7
  16. 70
  17. 62
  18. 19
  19. 24
  20. 23
  21. 47
  22. 33
  23. 15
  24. 1
  25. 46
  26. 32
  27. 48
  28. 83
  29. 74
  30. 88
  31. 50
  32. 89
  33. 42
  34. 72
  35. 49
  36. 78
  37. 28
  38. 3
  39. 40
  40. 56

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