Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 31 · 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 × 24 =
2. 2.24 × 16 =
3. 3.40 × 16 =
4. 4.21 × 16 =
5. 5.25 × 12 =
6. 6.13 × 12 =
7. 7.14 × 24 =
8. 8.29 × 16 =
9. 9.45 × 16 =
10. 10.42 × 18 =
11. 11.30 × 16 =
12. 12.35 × 16 =
13. 13.27 × 24 =
14. 14.36 × 24 =
15. 15.14 × 18 =
16. 16.45 × 24 =
17. 17.22 × 12 =
18. 18.32 × 14 =
19. 19.35 × 12 =
20. 20.19 × 12 =
21. 21.24 × 24 =
22. 22.16 × 24 =
23. 23.47 × 12 =
24. 24.17 × 12 =
25. 25.21 × 14 =
26. 26.31 × 24 =
27. 27.37 × 16 =
28. 28.34 × 16 =
29. 29.15 × 12 =
30. 30.39 × 14 =
31. 31.25 × 16 =
32. 32.38 × 15 =
33. 33.41 × 18 =
34. 34.28 × 24 =
35. 35.32 × 16 =
36. 36.14 × 12 =
37. 37.36 × 18 =
38. 38.45 × 15 =
39. 39.22 × 24 =
40. 40.22 × 18 =

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