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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 771 · 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. 1.29 × 16 =
  2. 2.38 × 12 =
  3. 3.11 × 18 =
  4. 4.44 × 12 =
  5. 5.47 × 15 =
  6. 6.16 × 12 =
  7. 7.30 × 15 =
  8. 8.34 × 12 =
  9. 9.43 × 16 =
  10. 10.13 × 18 =
  11. 11.22 × 14 =
  12. 12.41 × 12 =
  13. 13.16 × 18 =
  14. 14.33 × 15 =
  15. 15.44 × 16 =
  16. 16.20 × 12 =
  17. 17.27 × 14 =
  18. 18.33 × 14 =
  19. 19.39 × 15 =
  20. 20.47 × 16 =
  21. 21.12 × 16 =
  22. 22.29 × 14 =
  23. 23.19 × 24 =
  24. 24.27 × 15 =
  25. 25.41 × 24 =
  26. 26.15 × 15 =
  27. 27.28 × 12 =
  28. 28.24 × 24 =
  29. 29.34 × 18 =
  30. 30.37 × 16 =
  31. 31.37 × 12 =
  32. 32.47 × 12 =
  33. 33.36 × 24 =
  34. 34.12 × 12 =
  35. 35.22 × 18 =
  36. 36.30 × 16 =
  37. 37.33 × 24 =
  38. 38.34 × 15 =
  39. 39.37 × 18 =
  40. 40.14 × 15 =

Answer key

  1. 464
  2. 456
  3. 198
  4. 528
  5. 705
  6. 192
  7. 450
  8. 408
  9. 688
  10. 234
  11. 308
  12. 492
  13. 288
  14. 495
  15. 704
  16. 240
  17. 378
  18. 462
  19. 585
  20. 752
  21. 192
  22. 406
  23. 456
  24. 405
  25. 984
  26. 225
  27. 336
  28. 576
  29. 612
  30. 592
  31. 444
  32. 564
  33. 864
  34. 144
  35. 396
  36. 480
  37. 792
  38. 510
  39. 666
  40. 210

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