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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 193 · 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. 1.43 × 14 =
  2. 2.33 × 12 =
  3. 3.17 × 16 =
  4. 4.26 × 14 =
  5. 5.13 × 12 =
  6. 6.29 × 12 =
  7. 7.28 × 24 =
  8. 8.40 × 16 =
  9. 9.32 × 24 =
  10. 10.31 × 16 =
  11. 11.29 × 24 =
  12. 12.14 × 12 =
  13. 13.30 × 12 =
  14. 14.41 × 12 =
  15. 15.49 × 14 =
  16. 16.17 × 12 =
  17. 17.21 × 15 =
  18. 18.47 × 16 =
  19. 19.34 × 24 =
  20. 20.13 × 15 =
  21. 21.19 × 12 =
  22. 22.35 × 12 =
  23. 23.11 × 16 =
  24. 24.45 × 14 =
  25. 25.16 × 24 =
  26. 26.36 × 12 =
  27. 27.16 × 14 =
  28. 28.39 × 12 =
  29. 29.16 × 18 =
  30. 30.28 × 14 =
  31. 31.39 × 14 =
  32. 32.48 × 16 =
  33. 33.20 × 24 =
  34. 34.13 × 14 =
  35. 35.39 × 15 =
  36. 36.19 × 18 =
  37. 37.32 × 14 =
  38. 38.38 × 18 =
  39. 39.43 × 18 =
  40. 40.17 × 15 =

Answer key

  1. 602
  2. 396
  3. 272
  4. 364
  5. 156
  6. 348
  7. 672
  8. 640
  9. 768
  10. 496
  11. 696
  12. 168
  13. 360
  14. 492
  15. 686
  16. 204
  17. 315
  18. 752
  19. 816
  20. 195
  21. 228
  22. 420
  23. 176
  24. 630
  25. 384
  26. 432
  27. 224
  28. 468
  29. 288
  30. 392
  31. 546
  32. 768
  33. 480
  34. 182
  35. 585
  36. 342
  37. 448
  38. 684
  39. 774
  40. 255

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