Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 810 · 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. 1.46 × 12 =
2. 2.33 × 24 =
3. 3.49 × 14 =
4. 4.34 × 16 =
5. 5.30 × 18 =
6. 6.19 × 16 =
7. 7.44 × 15 =
8. 8.38 × 16 =
9. 9.36 × 15 =
10. 10.44 × 18 =
11. 11.15 × 14 =
12. 12.18 × 24 =
13. 13.13 × 18 =
14. 14.46 × 15 =
15. 15.38 × 14 =
16. 16.48 × 12 =
17. 17.44 × 16 =
18. 18.34 × 18 =
19. 19.24 × 15 =
20. 20.25 × 14 =
21. 21.29 × 15 =
22. 22.26 × 12 =
23. 23.30 × 12 =
24. 24.18 × 16 =
25. 25.22 × 12 =
26. 26.20 × 16 =
27. 27.27 × 12 =
28. 28.31 × 14 =
29. 29.11 × 18 =
30. 30.32 × 14 =
31. 31.37 × 18 =
32. 32.24 × 14 =
33. 33.27 × 18 =
34. 34.29 × 18 =
35. 35.40 × 12 =
36. 36.28 × 16 =
37. 37.28 × 24 =
38. 38.22 × 18 =
39. 39.47 × 24 =
40. 40.14 × 16 =

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