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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 323 · 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. 1.78 + ? = 100
  2. 2.82 + ? = 100
  3. 3.33 + ? = 100
  4. 4.8 + ? = 10
  5. 5.26 + ? = 100
  6. 6.63 + ? = 100
  7. 7.7 + ? = 10
  8. 8.6 + ? = 10
  9. 9.2 + ? = 10
  10. 10.72 + ? = 100
  11. 11.49 + ? = 100
  12. 12.76 + ? = 100
  13. 13.52 + ? = 100
  14. 14.40 + ? = 100
  15. 15.20 + ? = 100
  16. 16.5 + ? = 10
  17. 17.3 + ? = 10
  18. 18.12 + ? = 100
  19. 19.1 + ? = 10
  20. 20.9 + ? = 10
  21. 21.21 + ? = 100
  22. 22.81 + ? = 100
  23. 23.89 + ? = 100
  24. 24.17 + ? = 100
  25. 25.69 + ? = 100
  26. 26.43 + ? = 100
  27. 27.27 + ? = 100
  28. 28.22 + ? = 100
  29. 29.80 + ? = 100
  30. 30.37 + ? = 100
  31. 31.41 + ? = 100
  32. 32.68 + ? = 100
  33. 33.75 + ? = 100
  34. 34.18 + ? = 100
  35. 35.44 + ? = 100
  36. 36.85 + ? = 100
  37. 37.23 + ? = 100
  38. 38.4 + ? = 10
  39. 39.83 + ? = 100
  40. 40.61 + ? = 100

Answer key

  1. 22
  2. 18
  3. 67
  4. 2
  5. 74
  6. 37
  7. 3
  8. 4
  9. 8
  10. 28
  11. 51
  12. 24
  13. 48
  14. 60
  15. 80
  16. 5
  17. 7
  18. 88
  19. 9
  20. 1
  21. 79
  22. 19
  23. 11
  24. 83
  25. 31
  26. 57
  27. 73
  28. 78
  29. 20
  30. 63
  31. 59
  32. 32
  33. 25
  34. 82
  35. 56
  36. 15
  37. 77
  38. 6
  39. 17
  40. 39

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