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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 377 · 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. 1.11 × 24 =
  2. 2.32 × 16 =
  3. 3.28 × 12 =
  4. 4.19 × 12 =
  5. 5.32 × 15 =
  6. 6.16 × 18 =
  7. 7.21 × 16 =
  8. 8.22 × 12 =
  9. 9.19 × 15 =
  10. 10.44 × 15 =
  11. 11.40 × 18 =
  12. 12.22 × 15 =
  13. 13.49 × 12 =
  14. 14.21 × 24 =
  15. 15.17 × 15 =
  16. 16.48 × 16 =
  17. 17.38 × 12 =
  18. 18.12 × 14 =
  19. 19.27 × 15 =
  20. 20.19 × 14 =
  21. 21.43 × 14 =
  22. 22.31 × 12 =
  23. 23.38 × 24 =
  24. 24.23 × 24 =
  25. 25.15 × 18 =
  26. 26.47 × 12 =
  27. 27.22 × 14 =
  28. 28.31 × 16 =
  29. 29.30 × 12 =
  30. 30.34 × 24 =
  31. 31.25 × 12 =
  32. 32.14 × 14 =
  33. 33.25 × 18 =
  34. 34.37 × 18 =
  35. 35.32 × 12 =
  36. 36.13 × 14 =
  37. 37.21 × 15 =
  38. 38.46 × 16 =
  39. 39.43 × 16 =
  40. 40.12 × 12 =

Answer key

  1. 264
  2. 512
  3. 336
  4. 228
  5. 480
  6. 288
  7. 336
  8. 264
  9. 285
  10. 660
  11. 720
  12. 330
  13. 588
  14. 504
  15. 255
  16. 768
  17. 456
  18. 168
  19. 405
  20. 266
  21. 602
  22. 372
  23. 912
  24. 552
  25. 270
  26. 564
  27. 308
  28. 496
  29. 360
  30. 816
  31. 300
  32. 196
  33. 450
  34. 666
  35. 384
  36. 182
  37. 315
  38. 736
  39. 688
  40. 144

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