Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 179 · 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. 1.43 × 24 =
2. 2.22 × 14 =
3. 3.41 × 15 =
4. 4.20 × 14 =
5. 5.28 × 16 =
6. 6.35 × 12 =
7. 7.20 × 18 =
8. 8.43 × 12 =
9. 9.22 × 24 =
10. 10.40 × 14 =
11. 11.28 × 14 =
12. 12.14 × 15 =
13. 13.25 × 24 =
14. 14.18 × 16 =
15. 15.47 × 24 =
16. 16.42 × 18 =
17. 17.49 × 16 =
18. 18.17 × 12 =
19. 19.25 × 16 =
20. 20.32 × 16 =
21. 21.34 × 16 =
22. 22.21 × 14 =
23. 23.18 × 24 =
24. 24.30 × 14 =
25. 25.46 × 12 =
26. 26.40 × 24 =
27. 27.27 × 15 =
28. 28.35 × 14 =
29. 29.29 × 14 =
30. 30.47 × 12 =
31. 31.33 × 24 =
32. 32.16 × 24 =
33. 33.33 × 15 =
34. 34.46 × 14 =
35. 35.11 × 16 =
36. 36.29 × 15 =
37. 37.38 × 14 =
38. 38.37 × 15 =
39. 39.42 × 15 =
40. 40.34 × 12 =

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