Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 548 · 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 × 12 =
3. 3.34 × 16 =
4. 4.36 × 18 =
5. 5.12 × 15 =
6. 6.14 × 18 =
7. 7.22 × 14 =
8. 8.30 × 15 =
9. 9.48 × 12 =
10. 10.19 × 16 =
11. 11.19 × 12 =
12. 12.37 × 18 =
13. 13.41 × 24 =
14. 14.18 × 14 =
15. 15.49 × 12 =
16. 16.24 × 12 =
17. 17.12 × 14 =
18. 18.27 × 15 =
19. 19.48 × 14 =
20. 20.33 × 15 =
21. 21.30 × 12 =
22. 22.12 × 24 =
23. 23.37 × 12 =
24. 24.34 × 12 =
25. 25.15 × 18 =
26. 26.27 × 18 =
27. 27.13 × 14 =
28. 28.29 × 16 =
29. 29.14 × 24 =
30. 30.23 × 12 =
31. 31.18 × 24 =
32. 32.41 × 12 =
33. 33.35 × 14 =
34. 34.25 × 18 =
35. 35.27 × 14 =
36. 36.21 × 24 =
37. 37.17 × 24 =
38. 38.27 × 12 =
39. 39.46 × 14 =
40. 40.42 × 12 =

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