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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 852 · 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. 1.34 × 24 =
  2. 2.15 × 12 =
  3. 3.14 × 16 =
  4. 4.44 × 15 =
  5. 5.49 × 16 =
  6. 6.25 × 12 =
  7. 7.38 × 16 =
  8. 8.41 × 14 =
  9. 9.33 × 14 =
  10. 10.17 × 14 =
  11. 11.11 × 12 =
  12. 12.30 × 18 =
  13. 13.37 × 16 =
  14. 14.30 × 16 =
  15. 15.33 × 16 =
  16. 16.29 × 12 =
  17. 17.17 × 15 =
  18. 18.33 × 18 =
  19. 19.25 × 14 =
  20. 20.24 × 14 =
  21. 21.37 × 18 =
  22. 22.16 × 12 =
  23. 23.38 × 14 =
  24. 24.22 × 16 =
  25. 25.34 × 16 =
  26. 26.24 × 12 =
  27. 27.43 × 12 =
  28. 28.28 × 24 =
  29. 29.11 × 14 =
  30. 30.32 × 12 =
  31. 31.22 × 15 =
  32. 32.45 × 14 =
  33. 33.12 × 14 =
  34. 34.40 × 12 =
  35. 35.25 × 24 =
  36. 36.21 × 14 =
  37. 37.40 × 24 =
  38. 38.40 × 16 =
  39. 39.26 × 15 =
  40. 40.46 × 15 =

Answer key

  1. 816
  2. 180
  3. 224
  4. 660
  5. 784
  6. 300
  7. 608
  8. 574
  9. 462
  10. 238
  11. 132
  12. 540
  13. 592
  14. 480
  15. 528
  16. 348
  17. 255
  18. 594
  19. 350
  20. 336
  21. 666
  22. 192
  23. 532
  24. 352
  25. 544
  26. 288
  27. 516
  28. 672
  29. 154
  30. 384
  31. 330
  32. 630
  33. 168
  34. 480
  35. 600
  36. 294
  37. 960
  38. 640
  39. 390
  40. 690

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