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Multiply by 15 Worksheet

Speed calculation lesson 8: × 15: ten plus half · Set 568 · 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. 1.43 × 15 =
  2. 2.20 × 15 =
  3. 3.48 × 15 =
  4. 4.41 × 15 =
  5. 5.6 × 15 =
  6. 6.29 × 15 =
  7. 7.22 × 15 =
  8. 8.64 × 15 =
  9. 9.34 × 15 =
  10. 10.25 × 15 =
  11. 11.13 × 15 =
  12. 12.54 × 15 =
  13. 13.5 × 15 =
  14. 14.50 × 15 =
  15. 15.57 × 15 =
  16. 16.23 × 15 =
  17. 17.8 × 15 =
  18. 18.10 × 15 =
  19. 19.26 × 15 =
  20. 20.9 × 15 =
  21. 21.21 × 15 =
  22. 22.57 × 15 =
  23. 23.61 × 15 =
  24. 24.44 × 15 =
  25. 25.24 × 15 =
  26. 26.5 × 15 =
  27. 27.7 × 15 =
  28. 28.11 × 15 =
  29. 29.36 × 15 =
  30. 30.4 × 15 =
  31. 31.46 × 15 =
  32. 32.47 × 15 =
  33. 33.24 × 15 =
  34. 34.7 × 15 =
  35. 35.45 × 15 =
  36. 36.14 × 15 =
  37. 37.60 × 15 =
  38. 38.30 × 15 =
  39. 39.47 × 15 =
  40. 40.60 × 15 =

Answer key

  1. 645
  2. 300
  3. 720
  4. 615
  5. 90
  6. 435
  7. 330
  8. 960
  9. 510
  10. 375
  11. 195
  12. 810
  13. 75
  14. 750
  15. 855
  16. 345
  17. 120
  18. 150
  19. 390
  20. 135
  21. 315
  22. 855
  23. 915
  24. 660
  25. 360
  26. 75
  27. 105
  28. 165
  29. 540
  30. 60
  31. 690
  32. 705
  33. 360
  34. 105
  35. 675
  36. 210
  37. 900
  38. 450
  39. 705
  40. 900

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