Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 904 · 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. 1.27 × 16 =
2. 2.16 × 14 =
3. 3.43 × 18 =
4. 4.42 × 15 =
5. 5.20 × 24 =
6. 6.14 × 18 =
7. 7.16 × 24 =
8. 8.37 × 15 =
9. 9.17 × 18 =
10. 10.22 × 16 =
11. 11.42 × 12 =
12. 12.29 × 15 =
13. 13.33 × 16 =
14. 14.19 × 16 =
15. 15.34 × 14 =
16. 16.29 × 14 =
17. 17.43 × 12 =
18. 18.35 × 18 =
19. 19.49 × 15 =
20. 20.27 × 15 =
21. 21.12 × 16 =
22. 22.40 × 12 =
23. 23.22 × 15 =
24. 24.22 × 12 =
25. 25.32 × 18 =
26. 26.32 × 16 =
27. 27.43 × 15 =
28. 28.46 × 14 =
29. 29.15 × 16 =
30. 30.42 × 16 =
31. 31.48 × 16 =
32. 32.18 × 14 =
33. 33.40 × 15 =
34. 34.32 × 24 =
35. 35.25 × 12 =
36. 36.18 × 16 =
37. 37.46 × 15 =
38. 38.29 × 24 =
39. 39.42 × 14 =
40. 40.25 × 24 =

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