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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 272 · 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. 1.38 × 16 =
  2. 2.48 × 14 =
  3. 3.22 × 12 =
  4. 4.35 × 15 =
  5. 5.40 × 14 =
  6. 6.48 × 12 =
  7. 7.13 × 14 =
  8. 8.37 × 12 =
  9. 9.16 × 24 =
  10. 10.14 × 12 =
  11. 11.18 × 24 =
  12. 12.40 × 15 =
  13. 13.37 × 14 =
  14. 14.49 × 16 =
  15. 15.35 × 16 =
  16. 16.27 × 16 =
  17. 17.19 × 24 =
  18. 18.29 × 24 =
  19. 19.33 × 15 =
  20. 20.46 × 12 =
  21. 21.30 × 12 =
  22. 22.47 × 12 =
  23. 23.26 × 24 =
  24. 24.12 × 24 =
  25. 25.15 × 24 =
  26. 26.27 × 14 =
  27. 27.29 × 16 =
  28. 28.19 × 14 =
  29. 29.27 × 12 =
  30. 30.24 × 18 =
  31. 31.40 × 12 =
  32. 32.45 × 12 =
  33. 33.44 × 14 =
  34. 34.19 × 12 =
  35. 35.44 × 18 =
  36. 36.17 × 12 =
  37. 37.23 × 24 =
  38. 38.12 × 15 =
  39. 39.18 × 16 =
  40. 40.32 × 15 =

Answer key

  1. 608
  2. 672
  3. 264
  4. 525
  5. 560
  6. 576
  7. 182
  8. 444
  9. 384
  10. 168
  11. 432
  12. 600
  13. 518
  14. 784
  15. 560
  16. 432
  17. 456
  18. 696
  19. 495
  20. 552
  21. 360
  22. 564
  23. 624
  24. 288
  25. 360
  26. 378
  27. 464
  28. 266
  29. 324
  30. 432
  31. 480
  32. 540
  33. 616
  34. 228
  35. 792
  36. 204
  37. 552
  38. 180
  39. 288
  40. 480

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