Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 185 · 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. 2.18 × 12 =
3. 3.45 × 18 =
4. 4.41 × 12 =
5. 5.29 × 16 =
6. 6.24 × 15 =
7. 7.16 × 18 =
8. 8.24 × 12 =
9. 9.25 × 16 =
10. 10.30 × 12 =
11. 11.40 × 16 =
12. 12.14 × 24 =
13. 13.14 × 15 =
14. 14.13 × 12 =
15. 15.48 × 14 =
16. 16.22 × 12 =
17. 17.41 × 18 =
18. 18.39 × 12 =
19. 19.41 × 14 =
20. 20.11 × 14 =
21. 21.19 × 14 =
22. 22.26 × 12 =
23. 23.17 × 18 =
24. 24.27 × 12 =
25. 25.35 × 18 =
26. 26.42 × 24 =
27. 27.45 × 14 =
28. 28.22 × 16 =
29. 29.21 × 24 =
30. 30.43 × 18 =
31. 31.20 × 15 =
32. 32.34 × 16 =
33. 33.42 × 15 =
34. 34.28 × 24 =
35. 35.14 × 16 =
36. 36.15 × 24 =
37. 37.35 × 15 =
38. 38.11 × 18 =
39. 39.48 × 15 =
40. 40.17 × 16 =

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