Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 547 · 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. 1.38 × 24 =
2. 2.44 × 15 =
3. 3.25 × 18 =
4. 4.40 × 24 =
5. 5.16 × 24 =
6. 6.29 × 18 =
7. 7.14 × 12 =
8. 8.19 × 18 =
9. 9.15 × 16 =
10. 10.37 × 15 =
11. 11.20 × 16 =
12. 12.28 × 18 =
13. 13.36 × 18 =
14. 14.21 × 12 =
15. 15.39 × 12 =
16. 16.26 × 12 =
17. 17.18 × 15 =
18. 18.18 × 18 =
19. 19.46 × 24 =
20. 20.19 × 14 =
21. 21.26 × 24 =
22. 22.15 × 24 =
23. 23.44 × 24 =
24. 24.39 × 18 =
25. 25.32 × 16 =
26. 26.23 × 14 =
27. 27.11 × 12 =
28. 28.18 × 16 =
29. 29.16 × 18 =
30. 30.48 × 16 =
31. 31.20 × 12 =
32. 32.33 × 15 =
33. 33.20 × 15 =
34. 34.28 × 16 =
35. 35.36 × 12 =
36. 36.44 × 16 =
37. 37.39 × 14 =
38. 38.31 × 14 =
39. 39.35 × 16 =
40. 40.27 × 16 =

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