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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 63 · 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. 1.16 × 24 =
  2. 2.24 × 14 =
  3. 3.24 × 12 =
  4. 4.40 × 15 =
  5. 5.20 × 16 =
  6. 6.16 × 15 =
  7. 7.38 × 16 =
  8. 8.33 × 14 =
  9. 9.26 × 16 =
  10. 10.21 × 15 =
  11. 11.25 × 16 =
  12. 12.36 × 16 =
  13. 13.14 × 12 =
  14. 14.22 × 18 =
  15. 15.24 × 16 =
  16. 16.19 × 18 =
  17. 17.43 × 16 =
  18. 18.23 × 15 =
  19. 19.36 × 24 =
  20. 20.41 × 12 =
  21. 21.37 × 18 =
  22. 22.35 × 12 =
  23. 23.35 × 15 =
  24. 24.14 × 15 =
  25. 25.12 × 18 =
  26. 26.23 × 14 =
  27. 27.44 × 16 =
  28. 28.33 × 16 =
  29. 29.31 × 12 =
  30. 30.17 × 15 =
  31. 31.38 × 24 =
  32. 32.11 × 15 =
  33. 33.18 × 18 =
  34. 34.44 × 15 =
  35. 35.26 × 24 =
  36. 36.40 × 12 =
  37. 37.36 × 18 =
  38. 38.31 × 24 =
  39. 39.44 × 18 =
  40. 40.17 × 16 =

Answer key

  1. 384
  2. 336
  3. 288
  4. 600
  5. 320
  6. 240
  7. 608
  8. 462
  9. 416
  10. 315
  11. 400
  12. 576
  13. 168
  14. 396
  15. 384
  16. 342
  17. 688
  18. 345
  19. 864
  20. 492
  21. 666
  22. 420
  23. 525
  24. 210
  25. 216
  26. 322
  27. 704
  28. 528
  29. 372
  30. 255
  31. 912
  32. 165
  33. 324
  34. 660
  35. 624
  36. 480
  37. 648
  38. 744
  39. 792
  40. 272

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