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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 445 · 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. 1.47 × 15 =
  2. 2.19 × 24 =
  3. 3.17 × 16 =
  4. 4.45 × 12 =
  5. 5.13 × 16 =
  6. 6.19 × 18 =
  7. 7.41 × 12 =
  8. 8.23 × 24 =
  9. 9.28 × 14 =
  10. 10.11 × 16 =
  11. 11.48 × 12 =
  12. 12.20 × 16 =
  13. 13.37 × 15 =
  14. 14.26 × 12 =
  15. 15.22 × 12 =
  16. 16.39 × 24 =
  17. 17.16 × 14 =
  18. 18.29 × 16 =
  19. 19.15 × 14 =
  20. 20.24 × 14 =
  21. 21.37 × 18 =
  22. 22.42 × 14 =
  23. 23.20 × 12 =
  24. 24.45 × 15 =
  25. 25.23 × 12 =
  26. 26.14 × 18 =
  27. 27.29 × 15 =
  28. 28.33 × 16 =
  29. 29.40 × 14 =
  30. 30.11 × 18 =
  31. 31.28 × 15 =
  32. 32.39 × 15 =
  33. 33.21 × 18 =
  34. 34.32 × 12 =
  35. 35.14 × 12 =
  36. 36.24 × 15 =
  37. 37.35 × 24 =
  38. 38.36 × 24 =
  39. 39.33 × 24 =
  40. 40.13 × 15 =

Answer key

  1. 705
  2. 456
  3. 272
  4. 540
  5. 208
  6. 342
  7. 492
  8. 552
  9. 392
  10. 176
  11. 576
  12. 320
  13. 555
  14. 312
  15. 264
  16. 936
  17. 224
  18. 464
  19. 210
  20. 336
  21. 666
  22. 588
  23. 240
  24. 675
  25. 276
  26. 252
  27. 435
  28. 528
  29. 560
  30. 198
  31. 420
  32. 585
  33. 378
  34. 384
  35. 168
  36. 360
  37. 840
  38. 864
  39. 792
  40. 195

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