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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 68 · 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. 1.1 + ? = 10
  2. 2.6 + ? = 10
  3. 3.78 + ? = 100
  4. 4.27 + ? = 100
  5. 5.2 + ? = 10
  6. 6.11 + ? = 100
  7. 7.77 + ? = 100
  8. 8.8 + ? = 10
  9. 9.3 + ? = 10
  10. 10.5 + ? = 10
  11. 11.4 + ? = 10
  12. 12.80 + ? = 100
  13. 13.52 + ? = 100
  14. 14.62 + ? = 100
  15. 15.24 + ? = 100
  16. 16.51 + ? = 100
  17. 17.37 + ? = 100
  18. 18.34 + ? = 100
  19. 19.25 + ? = 100
  20. 20.31 + ? = 100
  21. 21.74 + ? = 100
  22. 22.36 + ? = 100
  23. 23.64 + ? = 100
  24. 24.23 + ? = 100
  25. 25.83 + ? = 100
  26. 26.39 + ? = 100
  27. 27.54 + ? = 100
  28. 28.9 + ? = 10
  29. 29.44 + ? = 100
  30. 30.43 + ? = 100
  31. 31.32 + ? = 100
  32. 32.79 + ? = 100
  33. 33.40 + ? = 100
  34. 34.67 + ? = 100
  35. 35.70 + ? = 100
  36. 36.57 + ? = 100
  37. 37.66 + ? = 100
  38. 38.42 + ? = 100
  39. 39.63 + ? = 100
  40. 40.76 + ? = 100

Answer key

  1. 9
  2. 4
  3. 22
  4. 73
  5. 8
  6. 89
  7. 23
  8. 2
  9. 7
  10. 5
  11. 6
  12. 20
  13. 48
  14. 38
  15. 76
  16. 49
  17. 63
  18. 66
  19. 75
  20. 69
  21. 26
  22. 64
  23. 36
  24. 77
  25. 17
  26. 61
  27. 46
  28. 1
  29. 56
  30. 57
  31. 68
  32. 21
  33. 60
  34. 33
  35. 30
  36. 43
  37. 34
  38. 58
  39. 37
  40. 24

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