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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 274 · 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. 1.41 × 15 =
  2. 2.31 × 14 =
  3. 3.41 × 18 =
  4. 4.19 × 14 =
  5. 5.13 × 16 =
  6. 6.19 × 18 =
  7. 7.44 × 12 =
  8. 8.24 × 16 =
  9. 9.16 × 18 =
  10. 10.45 × 14 =
  11. 11.44 × 16 =
  12. 12.34 × 18 =
  13. 13.24 × 15 =
  14. 14.20 × 16 =
  15. 15.22 × 16 =
  16. 16.22 × 12 =
  17. 17.39 × 15 =
  18. 18.22 × 18 =
  19. 19.11 × 15 =
  20. 20.46 × 12 =
  21. 21.29 × 24 =
  22. 22.18 × 18 =
  23. 23.11 × 12 =
  24. 24.30 × 12 =
  25. 25.21 × 18 =
  26. 26.39 × 16 =
  27. 27.18 × 15 =
  28. 28.32 × 14 =
  29. 29.39 × 24 =
  30. 30.11 × 14 =
  31. 31.40 × 14 =
  32. 32.30 × 16 =
  33. 33.27 × 18 =
  34. 34.20 × 15 =
  35. 35.28 × 15 =
  36. 36.47 × 16 =
  37. 37.21 × 14 =
  38. 38.35 × 15 =
  39. 39.18 × 24 =
  40. 40.22 × 15 =

Answer key

  1. 615
  2. 434
  3. 738
  4. 266
  5. 208
  6. 342
  7. 528
  8. 384
  9. 288
  10. 630
  11. 704
  12. 612
  13. 360
  14. 320
  15. 352
  16. 264
  17. 585
  18. 396
  19. 165
  20. 552
  21. 696
  22. 324
  23. 132
  24. 360
  25. 378
  26. 624
  27. 270
  28. 448
  29. 936
  30. 154
  31. 560
  32. 480
  33. 486
  34. 300
  35. 420
  36. 752
  37. 294
  38. 525
  39. 432
  40. 330

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