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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 652 · 40 questions
TalentJR

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

NameDateTime takenScore ___ / 40
  1. 1.20 × 24 =
  2. 2.49 × 12 =
  3. 3.15 × 16 =
  4. 4.49 × 18 =
  5. 5.27 × 24 =
  6. 6.19 × 14 =
  7. 7.13 × 18 =
  8. 8.13 × 16 =
  9. 9.44 × 14 =
  10. 10.12 × 12 =
  11. 11.11 × 18 =
  12. 12.28 × 24 =
  13. 13.17 × 16 =
  14. 14.38 × 12 =
  15. 15.27 × 16 =
  16. 16.12 × 16 =
  17. 17.40 × 16 =
  18. 18.41 × 24 =
  19. 19.24 × 12 =
  20. 20.22 × 14 =
  21. 21.22 × 12 =
  22. 22.18 × 12 =
  23. 23.49 × 14 =
  24. 24.45 × 18 =
  25. 25.38 × 18 =
  26. 26.36 × 15 =
  27. 27.44 × 16 =
  28. 28.43 × 15 =
  29. 29.23 × 16 =
  30. 30.36 × 12 =
  31. 31.48 × 14 =
  32. 32.26 × 15 =
  33. 33.14 × 24 =
  34. 34.39 × 16 =
  35. 35.42 × 16 =
  36. 36.34 × 16 =
  37. 37.34 × 12 =
  38. 38.32 × 16 =
  39. 39.20 × 14 =
  40. 40.33 × 24 =

Answer key

  1. 480
  2. 588
  3. 240
  4. 882
  5. 648
  6. 266
  7. 234
  8. 208
  9. 616
  10. 144
  11. 198
  12. 672
  13. 272
  14. 456
  15. 432
  16. 192
  17. 640
  18. 984
  19. 288
  20. 308
  21. 264
  22. 216
  23. 686
  24. 810
  25. 684
  26. 540
  27. 704
  28. 645
  29. 368
  30. 432
  31. 672
  32. 390
  33. 336
  34. 624
  35. 672
  36. 544
  37. 408
  38. 512
  39. 280
  40. 792

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