Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 664 · 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. 1.47 × 12 =
2. 2.19 × 14 =
3. 3.49 × 15 =
4. 4.34 × 15 =
5. 5.25 × 18 =
6. 6.45 × 24 =
7. 7.11 × 16 =
8. 8.26 × 12 =
9. 9.20 × 24 =
10. 10.39 × 18 =
11. 11.44 × 14 =
12. 12.18 × 12 =
13. 13.14 × 12 =
14. 14.32 × 24 =
15. 15.43 × 24 =
16. 16.13 × 16 =
17. 17.11 × 12 =
18. 18.22 × 18 =
19. 19.31 × 18 =
20. 20.32 × 16 =
21. 21.45 × 16 =
22. 22.14 × 24 =
23. 23.25 × 12 =
24. 24.13 × 14 =
25. 25.42 × 12 =
26. 26.28 × 24 =
27. 27.14 × 15 =
28. 28.27 × 14 =
29. 29.36 × 15 =
30. 30.22 × 14 =
31. 31.24 × 24 =
32. 32.35 × 16 =
33. 33.35 × 12 =
34. 34.33 × 16 =
35. 35.16 × 15 =
36. 36.49 × 18 =
37. 37.20 × 14 =
38. 38.36 × 12 =
39. 39.31 × 14 =
40. 40.22 × 12 =

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