Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 57 · 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. 1.28 × 24 =
2. 2.43 × 12 =
3. 3.35 × 16 =
4. 4.38 × 12 =
5. 5.27 × 15 =
6. 6.24 × 24 =
7. 7.32 × 14 =
8. 8.49 × 12 =
9. 9.48 × 14 =
10. 10.16 × 24 =
11. 11.36 × 14 =
12. 12.35 × 24 =
13. 13.42 × 24 =
14. 14.44 × 16 =
15. 15.49 × 14 =
16. 16.15 × 14 =
17. 17.26 × 18 =
18. 18.41 × 15 =
19. 19.38 × 24 =
20. 20.13 × 16 =
21. 21.26 × 15 =
22. 22.29 × 24 =
23. 23.15 × 18 =
24. 24.12 × 18 =
25. 25.26 × 14 =
26. 26.37 × 15 =
27. 27.25 × 16 =
28. 28.11 × 15 =
29. 29.21 × 12 =
30. 30.28 × 15 =
31. 31.32 × 24 =
32. 32.49 × 16 =
33. 33.20 × 12 =
34. 34.27 × 18 =
35. 35.33 × 14 =
36. 36.11 × 12 =
37. 37.35 × 12 =
38. 38.41 × 12 =
39. 39.12 × 14 =
40. 40.31 × 24 =

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