Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 492 · 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. 1.49 × 24 =
2. 2.18 × 15 =
3. 3.46 × 12 =
4. 4.25 × 16 =
5. 5.11 × 24 =
6. 6.18 × 12 =
7. 7.48 × 12 =
8. 8.41 × 24 =
9. 9.45 × 14 =
10. 10.26 × 18 =
11. 11.29 × 18 =
12. 12.38 × 14 =
13. 13.44 × 16 =
14. 14.35 × 24 =
15. 15.32 × 24 =
16. 16.40 × 18 =
17. 17.20 × 14 =
18. 18.34 × 12 =
19. 19.11 × 12 =
20. 20.12 × 18 =
21. 21.15 × 12 =
22. 22.15 × 24 =
23. 23.16 × 16 =
24. 24.29 × 12 =
25. 25.28 × 14 =
26. 26.42 × 14 =
27. 27.12 × 14 =
28. 28.26 × 12 =
29. 29.39 × 15 =
30. 30.42 × 16 =
31. 31.23 × 24 =
32. 32.49 × 14 =
33. 33.42 × 12 =
34. 34.47 × 16 =
35. 35.22 × 16 =
36. 36.14 × 16 =
37. 37.43 × 12 =
38. 38.31 × 18 =
39. 39.33 × 18 =
40. 40.22 × 24 =

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