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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 804 · 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. 1.26 × 12 =
  2. 2.22 × 12 =
  3. 3.25 × 14 =
  4. 4.48 × 14 =
  5. 5.38 × 14 =
  6. 6.19 × 12 =
  7. 7.11 × 14 =
  8. 8.14 × 18 =
  9. 9.34 × 15 =
  10. 10.41 × 12 =
  11. 11.24 × 14 =
  12. 12.34 × 16 =
  13. 13.29 × 14 =
  14. 14.18 × 12 =
  15. 15.24 × 12 =
  16. 16.31 × 18 =
  17. 17.17 × 12 =
  18. 18.49 × 18 =
  19. 19.17 × 14 =
  20. 20.37 × 14 =
  21. 21.28 × 15 =
  22. 22.38 × 15 =
  23. 23.43 × 16 =
  24. 24.31 × 15 =
  25. 25.47 × 16 =
  26. 26.22 × 16 =
  27. 27.42 × 16 =
  28. 28.16 × 24 =
  29. 29.13 × 14 =
  30. 30.44 × 14 =
  31. 31.13 × 24 =
  32. 32.46 × 14 =
  33. 33.14 × 14 =
  34. 34.43 × 12 =
  35. 35.11 × 15 =
  36. 36.42 × 14 =
  37. 37.44 × 18 =
  38. 38.15 × 18 =
  39. 39.28 × 16 =
  40. 40.23 × 15 =

Answer key

  1. 312
  2. 264
  3. 350
  4. 672
  5. 532
  6. 228
  7. 154
  8. 252
  9. 510
  10. 492
  11. 336
  12. 544
  13. 406
  14. 216
  15. 288
  16. 558
  17. 204
  18. 882
  19. 238
  20. 518
  21. 420
  22. 570
  23. 688
  24. 465
  25. 752
  26. 352
  27. 672
  28. 384
  29. 182
  30. 616
  31. 312
  32. 644
  33. 196
  34. 516
  35. 165
  36. 588
  37. 792
  38. 270
  39. 448
  40. 345

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