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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 143 · 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. 1.22 + ? = 100
  2. 2.30 + ? = 100
  3. 3.5 + ? = 10
  4. 4.1 + ? = 10
  5. 5.3 + ? = 10
  6. 6.68 + ? = 100
  7. 7.70 + ? = 100
  8. 8.81 + ? = 100
  9. 9.9 + ? = 10
  10. 10.31 + ? = 100
  11. 11.8 + ? = 10
  12. 12.46 + ? = 100
  13. 13.41 + ? = 100
  14. 14.6 + ? = 10
  15. 15.37 + ? = 100
  16. 16.29 + ? = 100
  17. 17.54 + ? = 100
  18. 18.23 + ? = 100
  19. 19.42 + ? = 100
  20. 20.25 + ? = 100
  21. 21.52 + ? = 100
  22. 22.28 + ? = 100
  23. 23.11 + ? = 100
  24. 24.20 + ? = 100
  25. 25.7 + ? = 10
  26. 26.64 + ? = 100
  27. 27.21 + ? = 100
  28. 28.26 + ? = 100
  29. 29.79 + ? = 100
  30. 30.38 + ? = 100
  31. 31.78 + ? = 100
  32. 32.48 + ? = 100
  33. 33.4 + ? = 10
  34. 34.56 + ? = 100
  35. 35.34 + ? = 100
  36. 36.33 + ? = 100
  37. 37.43 + ? = 100
  38. 38.44 + ? = 100
  39. 39.86 + ? = 100
  40. 40.74 + ? = 100

Answer key

  1. 78
  2. 70
  3. 5
  4. 9
  5. 7
  6. 32
  7. 30
  8. 19
  9. 1
  10. 69
  11. 2
  12. 54
  13. 59
  14. 4
  15. 63
  16. 71
  17. 46
  18. 77
  19. 58
  20. 75
  21. 48
  22. 72
  23. 89
  24. 80
  25. 3
  26. 36
  27. 79
  28. 74
  29. 21
  30. 62
  31. 22
  32. 52
  33. 6
  34. 44
  35. 66
  36. 67
  37. 57
  38. 56
  39. 14
  40. 26

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