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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 394 · 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. 1.23 × 12 =
  2. 2.24 × 15 =
  3. 3.46 × 12 =
  4. 4.35 × 15 =
  5. 5.19 × 12 =
  6. 6.22 × 16 =
  7. 7.48 × 12 =
  8. 8.14 × 14 =
  9. 9.45 × 16 =
  10. 10.27 × 18 =
  11. 11.15 × 15 =
  12. 12.39 × 18 =
  13. 13.42 × 16 =
  14. 14.34 × 18 =
  15. 15.28 × 18 =
  16. 16.28 × 15 =
  17. 17.15 × 24 =
  18. 18.40 × 18 =
  19. 19.36 × 15 =
  20. 20.32 × 18 =
  21. 21.14 × 16 =
  22. 22.49 × 14 =
  23. 23.29 × 12 =
  24. 24.44 × 12 =
  25. 25.25 × 24 =
  26. 26.33 × 15 =
  27. 27.18 × 15 =
  28. 28.16 × 15 =
  29. 29.26 × 15 =
  30. 30.37 × 15 =
  31. 31.14 × 24 =
  32. 32.13 × 14 =
  33. 33.47 × 12 =
  34. 34.21 × 15 =
  35. 35.38 × 24 =
  36. 36.23 × 14 =
  37. 37.20 × 24 =
  38. 38.16 × 12 =
  39. 39.21 × 14 =
  40. 40.41 × 24 =

Answer key

  1. 276
  2. 360
  3. 552
  4. 525
  5. 228
  6. 352
  7. 576
  8. 196
  9. 720
  10. 486
  11. 225
  12. 702
  13. 672
  14. 612
  15. 504
  16. 420
  17. 360
  18. 720
  19. 540
  20. 576
  21. 224
  22. 686
  23. 348
  24. 528
  25. 600
  26. 495
  27. 270
  28. 240
  29. 390
  30. 555
  31. 336
  32. 182
  33. 564
  34. 315
  35. 912
  36. 322
  37. 480
  38. 192
  39. 294
  40. 984

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