Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 586 · 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. 1.47 × 16 =
2. 2.35 × 24 =
3. 3.17 × 12 =
4. 4.29 × 14 =
5. 5.27 × 16 =
6. 6.20 × 16 =
7. 7.21 × 14 =
8. 8.40 × 15 =
9. 9.36 × 16 =
10. 10.20 × 12 =
11. 11.34 × 14 =
12. 12.16 × 12 =
13. 13.23 × 16 =
14. 14.17 × 24 =
15. 15.15 × 14 =
16. 16.33 × 15 =
17. 17.14 × 24 =
18. 18.33 × 12 =
19. 19.22 × 16 =
20. 20.29 × 15 =
21. 21.35 × 15 =
22. 22.49 × 12 =
23. 23.42 × 18 =
24. 24.22 × 12 =
25. 25.47 × 12 =
26. 26.22 × 14 =
27. 27.17 × 15 =
28. 28.42 × 24 =
29. 29.13 × 16 =
30. 30.38 × 12 =
31. 31.48 × 18 =
32. 32.21 × 12 =
33. 33.21 × 15 =
34. 34.30 × 14 =
35. 35.46 × 24 =
36. 36.47 × 18 =
37. 37.39 × 16 =
38. 38.30 × 18 =
39. 39.26 × 24 =
40. 40.15 × 15 =

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