Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 364 · 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. 1.17 × 12 =
2. 2.28 × 15 =
3. 3.14 × 14 =
4. 4.27 × 18 =
5. 5.19 × 15 =
6. 6.15 × 12 =
7. 7.33 × 24 =
8. 8.12 × 12 =
9. 9.16 × 14 =
10. 10.24 × 12 =
11. 11.22 × 16 =
12. 12.31 × 18 =
13. 13.38 × 24 =
14. 14.25 × 14 =
15. 15.14 × 15 =
16. 16.29 × 14 =
17. 17.20 × 12 =
18. 18.22 × 12 =
19. 19.48 × 16 =
20. 20.13 × 12 =
21. 21.17 × 18 =
22. 22.49 × 16 =
23. 23.15 × 14 =
24. 24.45 × 24 =
25. 25.18 × 15 =
26. 26.32 × 24 =
27. 27.47 × 14 =
28. 28.39 × 16 =
29. 29.32 × 14 =
30. 30.23 × 24 =
31. 31.44 × 24 =
32. 32.43 × 14 =
33. 33.34 × 14 =
34. 34.20 × 18 =
35. 35.23 × 16 =
36. 36.22 × 14 =
37. 37.26 × 14 =
38. 38.49 × 15 =
39. 39.49 × 12 =
40. 40.26 × 12 =

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