Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 295 · 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. 1.40 × 18 =
2. 2.16 × 12 =
3. 3.39 × 24 =
4. 4.25 × 12 =
5. 5.40 × 15 =
6. 6.48 × 16 =
7. 7.43 × 24 =
8. 8.13 × 15 =
9. 9.32 × 18 =
10. 10.16 × 15 =
11. 11.43 × 14 =
12. 12.38 × 15 =
13. 13.21 × 18 =
14. 14.36 × 24 =
15. 15.31 × 16 =
16. 16.25 × 14 =
17. 17.30 × 14 =
18. 18.40 × 16 =
19. 19.43 × 18 =
20. 20.48 × 12 =
21. 21.13 × 14 =
22. 22.17 × 12 =
23. 23.18 × 16 =
24. 24.35 × 12 =
25. 25.11 × 12 =
26. 26.15 × 18 =
27. 27.49 × 18 =
28. 28.21 × 14 =
29. 29.33 × 24 =
30. 30.45 × 12 =
31. 31.19 × 14 =
32. 32.44 × 12 =
33. 33.24 × 14 =
34. 34.43 × 15 =
35. 35.42 × 18 =
36. 36.38 × 16 =
37. 37.26 × 16 =
38. 38.19 × 16 =
39. 39.20 × 24 =
40. 40.28 × 24 =

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