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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 621 · 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. 1.63 + ? = 100
  2. 2.7 + ? = 10
  3. 3.27 + ? = 100
  4. 4.78 + ? = 100
  5. 5.38 + ? = 100
  6. 6.51 + ? = 100
  7. 7.19 + ? = 100
  8. 8.9 + ? = 10
  9. 9.6 + ? = 10
  10. 10.5 + ? = 10
  11. 11.3 + ? = 10
  12. 12.31 + ? = 100
  13. 13.8 + ? = 10
  14. 14.36 + ? = 100
  15. 15.53 + ? = 100
  16. 16.30 + ? = 100
  17. 17.20 + ? = 100
  18. 18.46 + ? = 100
  19. 19.72 + ? = 100
  20. 20.2 + ? = 10
  21. 21.42 + ? = 100
  22. 22.24 + ? = 100
  23. 23.37 + ? = 100
  24. 24.71 + ? = 100
  25. 25.1 + ? = 10
  26. 26.49 + ? = 100
  27. 27.4 + ? = 10
  28. 28.33 + ? = 100
  29. 29.83 + ? = 100
  30. 30.34 + ? = 100
  31. 31.11 + ? = 100
  32. 32.68 + ? = 100
  33. 33.26 + ? = 100
  34. 34.15 + ? = 100
  35. 35.23 + ? = 100
  36. 36.84 + ? = 100
  37. 37.86 + ? = 100
  38. 38.88 + ? = 100
  39. 39.44 + ? = 100
  40. 40.79 + ? = 100

Answer key

  1. 37
  2. 3
  3. 73
  4. 22
  5. 62
  6. 49
  7. 81
  8. 1
  9. 4
  10. 5
  11. 7
  12. 69
  13. 2
  14. 64
  15. 47
  16. 70
  17. 80
  18. 54
  19. 28
  20. 8
  21. 58
  22. 76
  23. 63
  24. 29
  25. 9
  26. 51
  27. 6
  28. 67
  29. 17
  30. 66
  31. 89
  32. 32
  33. 74
  34. 85
  35. 77
  36. 16
  37. 14
  38. 12
  39. 56
  40. 21

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