Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 424 · 40 questions

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).

1. 1.40 × 15 =
2. 2.33 × 12 =
3. 3.16 × 15 =
4. 4.28 × 16 =
5. 5.17 × 14 =
6. 6.17 × 15 =
7. 7.27 × 24 =
8. 8.49 × 12 =
9. 9.34 × 15 =
10. 10.13 × 18 =
11. 11.11 × 24 =
12. 12.27 × 12 =
13. 13.29 × 14 =
14. 14.44 × 14 =
15. 15.42 × 15 =
16. 16.34 × 12 =
17. 17.12 × 24 =
18. 18.20 × 24 =
19. 19.33 × 18 =
20. 20.32 × 12 =
21. 21.43 × 16 =
22. 22.46 × 14 =
23. 23.16 × 16 =
24. 24.35 × 14 =
25. 25.13 × 15 =
26. 26.20 × 14 =
27. 27.20 × 16 =
28. 28.16 × 24 =
29. 29.37 × 14 =
30. 30.29 × 24 =
31. 31.38 × 15 =
32. 32.48 × 14 =
33. 33.16 × 14 =
34. 34.35 × 16 =
35. 35.49 × 18 =
36. 36.26 × 16 =
37. 37.39 × 24 =
38. 38.19 × 15 =
39. 39.36 × 16 =
40. 40.38 × 12 =

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