Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 848 · 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. 1.13 × 24 =
2. 2.28 × 15 =
3. 3.13 × 15 =
4. 4.30 × 24 =
5. 5.24 × 18 =
6. 6.47 × 24 =
7. 7.25 × 12 =
8. 8.16 × 14 =
9. 9.15 × 16 =
10. 10.46 × 15 =
11. 11.44 × 14 =
12. 12.32 × 12 =
13. 13.24 × 15 =
14. 14.21 × 16 =
15. 15.12 × 14 =
16. 16.34 × 12 =
17. 17.29 × 15 =
18. 18.19 × 14 =
19. 19.46 × 16 =
20. 20.46 × 12 =
21. 21.18 × 12 =
22. 22.49 × 14 =
23. 23.15 × 12 =
24. 24.27 × 16 =
25. 25.17 × 16 =
26. 26.41 × 15 =
27. 27.35 × 24 =
28. 28.12 × 15 =
29. 29.36 × 24 =
30. 30.15 × 24 =
31. 31.29 × 16 =
32. 32.18 × 18 =
33. 33.12 × 12 =
34. 34.17 × 15 =
35. 35.49 × 15 =
36. 36.12 × 24 =
37. 37.47 × 14 =
38. 38.13 × 18 =
39. 39.39 × 14 =
40. 40.18 × 15 =

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