Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 885 · 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. 1.44 × 18 =
2. 2.37 × 18 =
3. 3.44 × 15 =
4. 4.19 × 12 =
5. 5.12 × 16 =
6. 6.30 × 24 =
7. 7.26 × 16 =
8. 8.14 × 15 =
9. 9.29 × 18 =
10. 10.44 × 16 =
11. 11.19 × 24 =
12. 12.15 × 18 =
13. 13.38 × 15 =
14. 14.34 × 14 =
15. 15.35 × 14 =
16. 16.13 × 12 =
17. 17.44 × 24 =
18. 18.25 × 24 =
19. 19.16 × 12 =
20. 20.13 × 24 =
21. 21.45 × 14 =
22. 22.30 × 18 =
23. 23.47 × 12 =
24. 24.29 × 15 =
25. 25.18 × 16 =
26. 26.33 × 24 =
27. 27.24 × 18 =
28. 28.45 × 12 =
29. 29.47 × 14 =
30. 30.39 × 12 =
31. 31.45 × 16 =
32. 32.16 × 14 =
33. 33.18 × 15 =
34. 34.17 × 16 =
35. 35.39 × 16 =
36. 36.11 × 12 =
37. 37.20 × 15 =
38. 38.26 × 15 =
39. 39.13 × 16 =
40. 40.21 × 18 =

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