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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 39 · 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. 1.36 × 24 =
  2. 2.20 × 24 =
  3. 3.37 × 16 =
  4. 4.20 × 12 =
  5. 5.20 × 16 =
  6. 6.39 × 14 =
  7. 7.43 × 16 =
  8. 8.39 × 12 =
  9. 9.37 × 12 =
  10. 10.28 × 24 =
  11. 11.48 × 15 =
  12. 12.27 × 14 =
  13. 13.15 × 14 =
  14. 14.21 × 12 =
  15. 15.45 × 12 =
  16. 16.43 × 12 =
  17. 17.25 × 14 =
  18. 18.12 × 24 =
  19. 19.33 × 12 =
  20. 20.45 × 18 =
  21. 21.26 × 16 =
  22. 22.28 × 16 =
  23. 23.47 × 12 =
  24. 24.44 × 12 =
  25. 25.36 × 16 =
  26. 26.29 × 24 =
  27. 27.31 × 16 =
  28. 28.17 × 12 =
  29. 29.11 × 14 =
  30. 30.38 × 15 =
  31. 31.18 × 15 =
  32. 32.49 × 18 =
  33. 33.32 × 12 =
  34. 34.21 × 24 =
  35. 35.15 × 16 =
  36. 36.16 × 12 =
  37. 37.26 × 24 =
  38. 38.45 × 14 =
  39. 39.14 × 24 =
  40. 40.21 × 15 =

Answer key

  1. 864
  2. 480
  3. 592
  4. 240
  5. 320
  6. 546
  7. 688
  8. 468
  9. 444
  10. 672
  11. 720
  12. 378
  13. 210
  14. 252
  15. 540
  16. 516
  17. 350
  18. 288
  19. 396
  20. 810
  21. 416
  22. 448
  23. 564
  24. 528
  25. 576
  26. 696
  27. 496
  28. 204
  29. 154
  30. 570
  31. 270
  32. 882
  33. 384
  34. 504
  35. 240
  36. 192
  37. 624
  38. 630
  39. 336
  40. 315

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