Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 65 · 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. 1.48 × 24 =
2. 2.23 × 24 =
3. 3.47 × 14 =
4. 4.35 × 18 =
5. 5.23 × 18 =
6. 6.19 × 14 =
7. 7.34 × 16 =
8. 8.29 × 16 =
9. 9.36 × 16 =
10. 10.12 × 12 =
11. 11.32 × 12 =
12. 12.17 × 18 =
13. 13.42 × 18 =
14. 14.49 × 12 =
15. 15.26 × 16 =
16. 16.37 × 12 =
17. 17.48 × 16 =
18. 18.42 × 14 =
19. 19.36 × 14 =
20. 20.18 × 15 =
21. 21.34 × 24 =
22. 22.33 × 18 =
23. 23.31 × 14 =
24. 24.18 × 12 =
25. 25.46 × 24 =
26. 26.23 × 12 =
27. 27.33 × 15 =
28. 28.40 × 14 =
29. 29.34 × 12 =
30. 30.37 × 14 =
31. 31.39 × 14 =
32. 32.49 × 15 =
33. 33.20 × 16 =
34. 34.32 × 18 =
35. 35.37 × 18 =
36. 36.36 × 24 =
37. 37.44 × 15 =
38. 38.16 × 16 =
39. 39.15 × 18 =
40. 40.41 × 16 =

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