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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 44 · 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. 1.19 × 12 =
  2. 2.47 × 12 =
  3. 3.35 × 18 =
  4. 4.36 × 12 =
  5. 5.41 × 18 =
  6. 6.21 × 18 =
  7. 7.13 × 15 =
  8. 8.35 × 24 =
  9. 9.38 × 12 =
  10. 10.22 × 18 =
  11. 11.34 × 14 =
  12. 12.20 × 15 =
  13. 13.11 × 15 =
  14. 14.33 × 14 =
  15. 15.30 × 15 =
  16. 16.19 × 14 =
  17. 17.26 × 14 =
  18. 18.18 × 12 =
  19. 19.20 × 24 =
  20. 20.13 × 12 =
  21. 21.37 × 14 =
  22. 22.29 × 18 =
  23. 23.14 × 15 =
  24. 24.28 × 14 =
  25. 25.17 × 14 =
  26. 26.19 × 24 =
  27. 27.29 × 14 =
  28. 28.29 × 24 =
  29. 29.45 × 18 =
  30. 30.21 × 14 =
  31. 31.19 × 16 =
  32. 32.38 × 16 =
  33. 33.15 × 15 =
  34. 34.46 × 16 =
  35. 35.14 × 16 =
  36. 36.47 × 15 =
  37. 37.21 × 16 =
  38. 38.47 × 14 =
  39. 39.38 × 15 =
  40. 40.41 × 15 =

Answer key

  1. 228
  2. 564
  3. 630
  4. 432
  5. 738
  6. 378
  7. 195
  8. 840
  9. 456
  10. 396
  11. 476
  12. 300
  13. 165
  14. 462
  15. 450
  16. 266
  17. 364
  18. 216
  19. 480
  20. 156
  21. 518
  22. 522
  23. 210
  24. 392
  25. 238
  26. 456
  27. 406
  28. 696
  29. 810
  30. 294
  31. 304
  32. 608
  33. 225
  34. 736
  35. 224
  36. 705
  37. 336
  38. 658
  39. 570
  40. 615

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