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Multiply by 15 Worksheet

Speed calculation lesson 8: × 15: ten plus half · Set 170 · 40 questions
TalentJR

The fast method (Ten and half again): Multiply by 10: 46 → 460. Halve that answer: half of 460 is 230. Add the two: 460 + 230 = 690.

NameDateTime takenScore ___ / 40
  1. 1.28 × 15 =
  2. 2.32 × 15 =
  3. 3.20 × 15 =
  4. 4.60 × 15 =
  5. 5.34 × 15 =
  6. 6.61 × 15 =
  7. 7.48 × 15 =
  8. 8.5 × 15 =
  9. 9.6 × 15 =
  10. 10.45 × 15 =
  11. 11.22 × 15 =
  12. 12.45 × 15 =
  13. 13.19 × 15 =
  14. 14.37 × 15 =
  15. 15.19 × 15 =
  16. 16.39 × 15 =
  17. 17.21 × 15 =
  18. 18.64 × 15 =
  19. 19.62 × 15 =
  20. 20.57 × 15 =
  21. 21.32 × 15 =
  22. 22.27 × 15 =
  23. 23.26 × 15 =
  24. 24.15 × 15 =
  25. 25.14 × 15 =
  26. 26.6 × 15 =
  27. 27.24 × 15 =
  28. 28.51 × 15 =
  29. 29.34 × 15 =
  30. 30.6 × 15 =
  31. 31.52 × 15 =
  32. 32.52 × 15 =
  33. 33.49 × 15 =
  34. 34.35 × 15 =
  35. 35.44 × 15 =
  36. 36.39 × 15 =
  37. 37.41 × 15 =
  38. 38.26 × 15 =
  39. 39.35 × 15 =
  40. 40.14 × 15 =

Answer key

  1. 420
  2. 480
  3. 300
  4. 900
  5. 510
  6. 915
  7. 720
  8. 75
  9. 90
  10. 675
  11. 330
  12. 675
  13. 285
  14. 555
  15. 285
  16. 585
  17. 315
  18. 960
  19. 930
  20. 855
  21. 480
  22. 405
  23. 390
  24. 225
  25. 210
  26. 90
  27. 360
  28. 765
  29. 510
  30. 90
  31. 780
  32. 780
  33. 735
  34. 525
  35. 660
  36. 585
  37. 615
  38. 390
  39. 525
  40. 210

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