Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 457 · 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. 1.42 × 14 =
2. 2.40 × 24 =
3. 3.44 × 24 =
4. 4.23 × 14 =
5. 5.41 × 16 =
6. 6.19 × 14 =
7. 7.12 × 12 =
8. 8.35 × 15 =
9. 9.48 × 14 =
10. 10.46 × 18 =
11. 11.37 × 24 =
12. 12.26 × 12 =
13. 13.31 × 12 =
14. 14.42 × 12 =
15. 15.38 × 16 =
16. 16.33 × 24 =
17. 17.14 × 16 =
18. 18.11 × 16 =
19. 19.21 × 12 =
20. 20.24 × 12 =
21. 21.19 × 15 =
22. 22.33 × 16 =
23. 23.18 × 16 =
24. 24.44 × 14 =
25. 25.18 × 18 =
26. 26.37 × 18 =
27. 27.49 × 15 =
28. 28.14 × 15 =
29. 29.22 × 12 =
30. 30.22 × 15 =
31. 31.41 × 12 =
32. 32.27 × 14 =
33. 33.31 × 16 =
34. 34.16 × 24 =
35. 35.34 × 18 =
36. 36.11 × 15 =
37. 37.36 × 18 =
38. 38.48 × 24 =
39. 39.25 × 18 =
40. 40.34 × 14 =

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