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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 680 · 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. 1.41 × 24 =
  2. 2.28 × 14 =
  3. 3.25 × 18 =
  4. 4.29 × 18 =
  5. 5.15 × 16 =
  6. 6.27 × 16 =
  7. 7.49 × 18 =
  8. 8.14 × 15 =
  9. 9.48 × 24 =
  10. 10.19 × 18 =
  11. 11.22 × 15 =
  12. 12.16 × 14 =
  13. 13.30 × 15 =
  14. 14.17 × 18 =
  15. 15.48 × 16 =
  16. 16.20 × 15 =
  17. 17.41 × 18 =
  18. 18.13 × 12 =
  19. 19.26 × 16 =
  20. 20.40 × 15 =
  21. 21.32 × 18 =
  22. 22.23 × 12 =
  23. 23.49 × 15 =
  24. 24.39 × 16 =
  25. 25.38 × 12 =
  26. 26.32 × 15 =
  27. 27.44 × 14 =
  28. 28.48 × 14 =
  29. 29.19 × 24 =
  30. 30.25 × 12 =
  31. 31.36 × 24 =
  32. 32.30 × 12 =
  33. 33.20 × 24 =
  34. 34.11 × 24 =
  35. 35.19 × 12 =
  36. 36.47 × 15 =
  37. 37.19 × 16 =
  38. 38.44 × 12 =
  39. 39.35 × 14 =
  40. 40.11 × 16 =

Answer key

  1. 984
  2. 392
  3. 450
  4. 522
  5. 240
  6. 432
  7. 882
  8. 210
  9. 1152
  10. 342
  11. 330
  12. 224
  13. 450
  14. 306
  15. 768
  16. 300
  17. 738
  18. 156
  19. 416
  20. 600
  21. 576
  22. 276
  23. 735
  24. 624
  25. 456
  26. 480
  27. 616
  28. 672
  29. 456
  30. 300
  31. 864
  32. 360
  33. 480
  34. 264
  35. 228
  36. 705
  37. 304
  38. 528
  39. 490
  40. 176

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