Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 673 · 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. 1.33 × 12 =
2. 2.43 × 12 =
3. 3.46 × 12 =
4. 4.28 × 18 =
5. 5.40 × 16 =
6. 6.48 × 12 =
7. 7.20 × 16 =
8. 8.18 × 16 =
9. 9.11 × 18 =
10. 10.18 × 24 =
11. 11.11 × 24 =
12. 12.20 × 15 =
13. 13.35 × 24 =
14. 14.41 × 18 =
15. 15.19 × 12 =
16. 16.40 × 24 =
17. 17.37 × 16 =
18. 18.12 × 14 =
19. 19.28 × 12 =
20. 20.43 × 24 =
21. 21.46 × 14 =
22. 22.42 × 12 =
23. 23.33 × 18 =
24. 24.21 × 15 =
25. 25.14 × 14 =
26. 26.49 × 18 =
27. 27.43 × 14 =
28. 28.44 × 14 =
29. 29.18 × 18 =
30. 30.27 × 18 =
31. 31.47 × 14 =
32. 32.36 × 16 =
33. 33.11 × 16 =
34. 34.33 × 14 =
35. 35.36 × 15 =
36. 36.20 × 12 =
37. 37.38 × 12 =
38. 38.16 × 14 =
39. 39.46 × 24 =
40. 40.49 × 14 =

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