Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 334 · 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. 1.19 × 18 =
2. 2.46 × 18 =
3. 3.36 × 12 =
4. 4.36 × 18 =
5. 5.35 × 15 =
6. 6.33 × 16 =
7. 7.16 × 24 =
8. 8.47 × 24 =
9. 9.31 × 14 =
10. 10.47 × 12 =
11. 11.18 × 14 =
12. 12.25 × 12 =
13. 13.49 × 12 =
14. 14.37 × 12 =
15. 15.28 × 12 =
16. 16.12 × 12 =
17. 17.20 × 24 =
18. 18.20 × 15 =
19. 19.24 × 16 =
20. 20.22 × 24 =
21. 21.28 × 18 =
22. 22.43 × 24 =
23. 23.49 × 18 =
24. 24.45 × 12 =
25. 25.22 × 16 =
26. 26.14 × 15 =
27. 27.29 × 15 =
28. 28.25 × 18 =
29. 29.18 × 16 =
30. 30.39 × 16 =
31. 31.39 × 18 =
32. 32.30 × 24 =
33. 33.35 × 18 =
34. 34.33 × 18 =
35. 35.26 × 12 =
36. 36.44 × 14 =
37. 37.33 × 15 =
38. 38.16 × 18 =
39. 39.17 × 15 =
40. 40.24 × 24 =

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