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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 246 · 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. 1.35 × 14 =
  2. 2.17 × 12 =
  3. 3.35 × 16 =
  4. 4.15 × 18 =
  5. 5.33 × 15 =
  6. 6.44 × 12 =
  7. 7.37 × 12 =
  8. 8.19 × 12 =
  9. 9.47 × 16 =
  10. 10.49 × 12 =
  11. 11.22 × 15 =
  12. 12.25 × 16 =
  13. 13.18 × 24 =
  14. 14.21 × 24 =
  15. 15.20 × 12 =
  16. 16.16 × 24 =
  17. 17.44 × 14 =
  18. 18.44 × 15 =
  19. 19.16 × 14 =
  20. 20.47 × 14 =
  21. 21.45 × 15 =
  22. 22.13 × 16 =
  23. 23.31 × 15 =
  24. 24.29 × 24 =
  25. 25.19 × 24 =
  26. 26.43 × 12 =
  27. 27.16 × 16 =
  28. 28.42 × 18 =
  29. 29.14 × 14 =
  30. 30.35 × 18 =
  31. 31.43 × 16 =
  32. 32.19 × 14 =
  33. 33.30 × 24 =
  34. 34.23 × 16 =
  35. 35.37 × 16 =
  36. 36.48 × 12 =
  37. 37.14 × 15 =
  38. 38.42 × 12 =
  39. 39.44 × 16 =
  40. 40.36 × 18 =

Answer key

  1. 490
  2. 204
  3. 560
  4. 270
  5. 495
  6. 528
  7. 444
  8. 228
  9. 752
  10. 588
  11. 330
  12. 400
  13. 432
  14. 504
  15. 240
  16. 384
  17. 616
  18. 660
  19. 224
  20. 658
  21. 675
  22. 208
  23. 465
  24. 696
  25. 456
  26. 516
  27. 256
  28. 756
  29. 196
  30. 630
  31. 688
  32. 266
  33. 720
  34. 368
  35. 592
  36. 576
  37. 210
  38. 504
  39. 704
  40. 648

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