Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 353 · 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 × 24 =
2. 2.12 × 15 =
3. 3.16 × 12 =
4. 4.20 × 12 =
5. 5.32 × 12 =
6. 6.21 × 15 =
7. 7.44 × 24 =
8. 8.43 × 12 =
9. 9.20 × 18 =
10. 10.18 × 24 =
11. 11.22 × 15 =
12. 12.47 × 15 =
13. 13.41 × 16 =
14. 14.43 × 14 =
15. 15.26 × 18 =
16. 16.24 × 15 =
17. 17.31 × 12 =
18. 18.42 × 14 =
19. 19.22 × 16 =
20. 20.35 × 24 =
21. 21.26 × 24 =
22. 22.40 × 18 =
23. 23.27 × 16 =
24. 24.15 × 24 =
25. 25.24 × 18 =
26. 26.46 × 16 =
27. 27.25 × 15 =
28. 28.24 × 24 =
29. 29.13 × 18 =
30. 30.41 × 18 =
31. 31.22 × 24 =
32. 32.42 × 15 =
33. 33.29 × 12 =
34. 34.41 × 14 =
35. 35.31 × 18 =
36. 36.23 × 14 =
37. 37.44 × 18 =
38. 38.36 × 16 =
39. 39.35 × 14 =
40. 40.30 × 16 =

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