Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 236 · 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 × 12 =
3. 3.11 × 18 =
4. 4.30 × 18 =
5. 5.27 × 18 =
6. 6.12 × 12 =
7. 7.28 × 16 =
8. 8.24 × 24 =
9. 9.23 × 18 =
10. 10.32 × 14 =
11. 11.28 × 14 =
12. 12.36 × 14 =
13. 13.47 × 16 =
14. 14.33 × 14 =
15. 15.19 × 24 =
16. 16.38 × 12 =
17. 17.46 × 18 =
18. 18.48 × 14 =
19. 19.43 × 12 =
20. 20.30 × 16 =
21. 21.36 × 16 =
22. 22.49 × 16 =
23. 23.39 × 16 =
24. 24.25 × 14 =
25. 25.27 × 24 =
26. 26.25 × 12 =
27. 27.38 × 14 =
28. 28.34 × 14 =
29. 29.23 × 12 =
30. 30.21 × 15 =
31. 31.47 × 14 =
32. 32.28 × 24 =
33. 33.49 × 24 =
34. 34.18 × 24 =
35. 35.35 × 12 =
36. 36.20 × 12 =
37. 37.11 × 12 =
38. 38.32 × 15 =
39. 39.42 × 14 =
40. 40.19 × 15 =

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