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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 175 · 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. 1.14 × 14 =
  2. 2.48 × 15 =
  3. 3.13 × 16 =
  4. 4.34 × 15 =
  5. 5.39 × 18 =
  6. 6.34 × 14 =
  7. 7.32 × 18 =
  8. 8.47 × 14 =
  9. 9.46 × 18 =
  10. 10.44 × 12 =
  11. 11.17 × 15 =
  12. 12.45 × 12 =
  13. 13.14 × 12 =
  14. 14.20 × 24 =
  15. 15.36 × 14 =
  16. 16.19 × 24 =
  17. 17.33 × 14 =
  18. 18.17 × 12 =
  19. 19.21 × 12 =
  20. 20.42 × 14 =
  21. 21.42 × 16 =
  22. 22.36 × 16 =
  23. 23.37 × 24 =
  24. 24.17 × 24 =
  25. 25.29 × 12 =
  26. 26.20 × 12 =
  27. 27.41 × 16 =
  28. 28.14 × 18 =
  29. 29.35 × 18 =
  30. 30.48 × 18 =
  31. 31.25 × 16 =
  32. 32.20 × 18 =
  33. 33.48 × 12 =
  34. 34.38 × 16 =
  35. 35.33 × 18 =
  36. 36.16 × 15 =
  37. 37.45 × 14 =
  38. 38.13 × 14 =
  39. 39.16 × 18 =
  40. 40.33 × 15 =

Answer key

  1. 196
  2. 720
  3. 208
  4. 510
  5. 702
  6. 476
  7. 576
  8. 658
  9. 828
  10. 528
  11. 255
  12. 540
  13. 168
  14. 480
  15. 504
  16. 456
  17. 462
  18. 204
  19. 252
  20. 588
  21. 672
  22. 576
  23. 888
  24. 408
  25. 348
  26. 240
  27. 656
  28. 252
  29. 630
  30. 864
  31. 400
  32. 360
  33. 576
  34. 608
  35. 594
  36. 240
  37. 630
  38. 182
  39. 288
  40. 495

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