Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 371 · 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. 1.32 × 12 =
2. 2.16 × 14 =
3. 3.11 × 15 =
4. 4.44 × 24 =
5. 5.47 × 12 =
6. 6.15 × 18 =
7. 7.36 × 16 =
8. 8.13 × 18 =
9. 9.32 × 18 =
10. 10.21 × 16 =
11. 11.48 × 12 =
12. 12.44 × 18 =
13. 13.49 × 12 =
14. 14.19 × 24 =
15. 15.34 × 15 =
16. 16.40 × 15 =
17. 17.18 × 15 =
18. 18.37 × 15 =
19. 19.26 × 18 =
20. 20.13 × 16 =
21. 21.38 × 12 =
22. 22.42 × 18 =
23. 23.37 × 14 =
24. 24.18 × 18 =
25. 25.11 × 14 =
26. 26.35 × 24 =
27. 27.27 × 12 =
28. 28.11 × 24 =
29. 29.21 × 18 =
30. 30.11 × 16 =
31. 31.26 × 16 =
32. 32.15 × 24 =
33. 33.46 × 18 =
34. 34.38 × 16 =
35. 35.21 × 14 =
36. 36.19 × 14 =
37. 37.32 × 14 =
38. 38.24 × 12 =
39. 39.17 × 14 =
40. 40.11 × 18 =

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