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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 617 · 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. 1.48 × 16 =
  2. 2.18 × 24 =
  3. 3.33 × 12 =
  4. 4.38 × 15 =
  5. 5.18 × 15 =
  6. 6.23 × 12 =
  7. 7.33 × 18 =
  8. 8.41 × 12 =
  9. 9.32 × 18 =
  10. 10.22 × 18 =
  11. 11.27 × 14 =
  12. 12.28 × 14 =
  13. 13.19 × 16 =
  14. 14.24 × 15 =
  15. 15.45 × 14 =
  16. 16.17 × 14 =
  17. 17.18 × 16 =
  18. 18.45 × 15 =
  19. 19.42 × 15 =
  20. 20.16 × 24 =
  21. 21.11 × 15 =
  22. 22.24 × 14 =
  23. 23.39 × 24 =
  24. 24.36 × 14 =
  25. 25.19 × 24 =
  26. 26.12 × 14 =
  27. 27.15 × 14 =
  28. 28.40 × 14 =
  29. 29.44 × 12 =
  30. 30.46 × 14 =
  31. 31.19 × 18 =
  32. 32.14 × 24 =
  33. 33.28 × 16 =
  34. 34.40 × 12 =
  35. 35.29 × 18 =
  36. 36.49 × 15 =
  37. 37.43 × 12 =
  38. 38.13 × 16 =
  39. 39.42 × 14 =
  40. 40.22 × 14 =

Answer key

  1. 768
  2. 432
  3. 396
  4. 570
  5. 270
  6. 276
  7. 594
  8. 492
  9. 576
  10. 396
  11. 378
  12. 392
  13. 304
  14. 360
  15. 630
  16. 238
  17. 288
  18. 675
  19. 630
  20. 384
  21. 165
  22. 336
  23. 936
  24. 504
  25. 456
  26. 168
  27. 210
  28. 560
  29. 528
  30. 644
  31. 342
  32. 336
  33. 448
  34. 480
  35. 522
  36. 735
  37. 516
  38. 208
  39. 588
  40. 308

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