Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 950 · 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. 2.35 × 18 =
3. 3.26 × 24 =
4. 4.34 × 15 =
5. 5.18 × 14 =
6. 6.16 × 15 =
7. 7.15 × 15 =
8. 8.39 × 16 =
9. 9.47 × 15 =
10. 10.13 × 14 =
11. 11.21 × 14 =
12. 12.44 × 15 =
13. 13.27 × 14 =
14. 14.12 × 15 =
15. 15.28 × 14 =
16. 16.47 × 14 =
17. 17.15 × 14 =
18. 18.20 × 16 =
19. 19.35 × 24 =
20. 20.16 × 18 =
21. 21.17 × 14 =
22. 22.16 × 16 =
23. 23.18 × 18 =
24. 24.45 × 12 =
25. 25.22 × 16 =
26. 26.37 × 14 =
27. 27.12 × 14 =
28. 28.48 × 14 =
29. 29.48 × 12 =
30. 30.25 × 16 =
31. 31.14 × 24 =
32. 32.49 × 12 =
33. 33.22 × 15 =
34. 34.43 × 18 =
35. 35.38 × 14 =
36. 36.21 × 24 =
37. 37.43 × 24 =
38. 38.44 × 24 =
39. 39.49 × 24 =
40. 40.46 × 24 =

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