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Multiply by 15 Worksheet

Speed calculation lesson 8: × 15: ten plus half · Set 971 · 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. 1.58 × 15 =
  2. 2.57 × 15 =
  3. 3.21 × 15 =
  4. 4.22 × 15 =
  5. 5.14 × 15 =
  6. 6.27 × 15 =
  7. 7.54 × 15 =
  8. 8.54 × 15 =
  9. 9.20 × 15 =
  10. 10.33 × 15 =
  11. 11.20 × 15 =
  12. 12.61 × 15 =
  13. 13.19 × 15 =
  14. 14.49 × 15 =
  15. 15.35 × 15 =
  16. 16.31 × 15 =
  17. 17.5 × 15 =
  18. 18.42 × 15 =
  19. 19.41 × 15 =
  20. 20.34 × 15 =
  21. 21.46 × 15 =
  22. 22.35 × 15 =
  23. 23.23 × 15 =
  24. 24.19 × 15 =
  25. 25.48 × 15 =
  26. 26.60 × 15 =
  27. 27.18 × 15 =
  28. 28.44 × 15 =
  29. 29.26 × 15 =
  30. 30.15 × 15 =
  31. 31.38 × 15 =
  32. 32.51 × 15 =
  33. 33.8 × 15 =
  34. 34.40 × 15 =
  35. 35.34 × 15 =
  36. 36.19 × 15 =
  37. 37.43 × 15 =
  38. 38.19 × 15 =
  39. 39.22 × 15 =
  40. 40.55 × 15 =

Answer key

  1. 870
  2. 855
  3. 315
  4. 330
  5. 210
  6. 405
  7. 810
  8. 810
  9. 300
  10. 495
  11. 300
  12. 915
  13. 285
  14. 735
  15. 525
  16. 465
  17. 75
  18. 630
  19. 615
  20. 510
  21. 690
  22. 525
  23. 345
  24. 285
  25. 720
  26. 900
  27. 270
  28. 660
  29. 390
  30. 225
  31. 570
  32. 765
  33. 120
  34. 600
  35. 510
  36. 285
  37. 645
  38. 285
  39. 330
  40. 825

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