Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 177 · 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. 1.15 × 24 =
2. 2.16 × 24 =
3. 3.28 × 16 =
4. 4.41 × 15 =
5. 5.22 × 16 =
6. 6.41 × 18 =
7. 7.30 × 12 =
8. 8.33 × 24 =
9. 9.34 × 14 =
10. 10.13 × 24 =
11. 11.17 × 16 =
12. 12.16 × 12 =
13. 13.49 × 18 =
14. 14.48 × 16 =
15. 15.38 × 24 =
16. 16.44 × 18 =
17. 17.37 × 15 =
18. 18.37 × 24 =
19. 19.49 × 24 =
20. 20.44 × 15 =
21. 21.17 × 18 =
22. 22.24 × 15 =
23. 23.13 × 14 =
24. 24.28 × 15 =
25. 25.34 × 16 =
26. 26.29 × 18 =
27. 27.46 × 16 =
28. 28.14 × 15 =
29. 29.11 × 12 =
30. 30.49 × 14 =
31. 31.25 × 14 =
32. 32.39 × 24 =
33. 33.30 × 14 =
34. 34.35 × 16 =
35. 35.19 × 14 =
36. 36.20 × 16 =
37. 37.44 × 16 =
38. 38.34 × 18 =
39. 39.19 × 18 =
40. 40.46 × 12 =

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