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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 219 · 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. 1.33 × 12 =
  2. 2.14 × 16 =
  3. 3.34 × 12 =
  4. 4.18 × 18 =
  5. 5.29 × 24 =
  6. 6.41 × 14 =
  7. 7.43 × 12 =
  8. 8.44 × 12 =
  9. 9.32 × 14 =
  10. 10.16 × 16 =
  11. 11.25 × 14 =
  12. 12.11 × 12 =
  13. 13.20 × 12 =
  14. 14.21 × 18 =
  15. 15.33 × 16 =
  16. 16.34 × 15 =
  17. 17.43 × 16 =
  18. 18.40 × 16 =
  19. 19.36 × 14 =
  20. 20.16 × 15 =
  21. 21.44 × 14 =
  22. 22.16 × 24 =
  23. 23.29 × 12 =
  24. 24.14 × 12 =
  25. 25.27 × 24 =
  26. 26.38 × 18 =
  27. 27.29 × 16 =
  28. 28.12 × 24 =
  29. 29.20 × 18 =
  30. 30.36 × 12 =
  31. 31.15 × 14 =
  32. 32.26 × 24 =
  33. 33.44 × 16 =
  34. 34.39 × 12 =
  35. 35.39 × 14 =
  36. 36.28 × 12 =
  37. 37.37 × 15 =
  38. 38.23 × 16 =
  39. 39.33 × 24 =
  40. 40.26 × 16 =

Answer key

  1. 396
  2. 224
  3. 408
  4. 324
  5. 696
  6. 574
  7. 516
  8. 528
  9. 448
  10. 256
  11. 350
  12. 132
  13. 240
  14. 378
  15. 528
  16. 510
  17. 688
  18. 640
  19. 504
  20. 240
  21. 616
  22. 384
  23. 348
  24. 168
  25. 648
  26. 684
  27. 464
  28. 288
  29. 360
  30. 432
  31. 210
  32. 624
  33. 704
  34. 468
  35. 546
  36. 336
  37. 555
  38. 368
  39. 792
  40. 416

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