Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 378 · 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. 1.20 × 14 =
2. 2.19 × 18 =
3. 3.30 × 16 =
4. 4.38 × 12 =
5. 5.33 × 16 =
6. 6.22 × 14 =
7. 7.15 × 14 =
8. 8.11 × 18 =
9. 9.18 × 18 =
10. 10.20 × 12 =
11. 11.32 × 24 =
12. 12.42 × 18 =
13. 13.49 × 15 =
14. 14.13 × 12 =
15. 15.30 × 12 =
16. 16.48 × 12 =
17. 17.14 × 15 =
18. 18.36 × 18 =
19. 19.27 × 16 =
20. 20.16 × 24 =
21. 21.20 × 16 =
22. 22.24 × 12 =
23. 23.38 × 14 =
24. 24.42 × 24 =
25. 25.34 × 15 =
26. 26.45 × 16 =
27. 27.12 × 24 =
28. 28.26 × 14 =
29. 29.24 × 15 =
30. 30.22 × 24 =
31. 31.12 × 16 =
32. 32.31 × 14 =
33. 33.24 × 24 =
34. 34.46 × 12 =
35. 35.40 × 18 =
36. 36.21 × 15 =
37. 37.38 × 24 =
38. 38.44 × 16 =
39. 39.36 × 14 =
40. 40.20 × 15 =

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