Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 276 · 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 × 14 =
2. 2.15 × 15 =
3. 3.43 × 15 =
4. 4.47 × 24 =
5. 5.21 × 12 =
6. 6.12 × 16 =
7. 7.23 × 12 =
8. 8.15 × 24 =
9. 9.42 × 15 =
10. 10.26 × 14 =
11. 11.23 × 18 =
12. 12.16 × 14 =
13. 13.14 × 18 =
14. 14.24 × 18 =
15. 15.32 × 15 =
16. 16.18 × 14 =
17. 17.32 × 16 =
18. 18.29 × 24 =
19. 19.19 × 16 =
20. 20.33 × 16 =
21. 21.38 × 24 =
22. 22.24 × 16 =
23. 23.37 × 18 =
24. 24.28 × 15 =
25. 25.47 × 14 =
26. 26.18 × 18 =
27. 27.34 × 15 =
28. 28.31 × 15 =
29. 29.49 × 18 =
30. 30.11 × 24 =
31. 31.34 × 16 =
32. 32.28 × 16 =
33. 33.21 × 14 =
34. 34.29 × 14 =
35. 35.37 × 24 =
36. 36.43 × 14 =
37. 37.26 × 24 =
38. 38.22 × 14 =
39. 39.42 × 12 =
40. 40.46 × 18 =

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