Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 506 · 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 × 12 =
2. 2.47 × 16 =
3. 3.48 × 16 =
4. 4.16 × 24 =
5. 5.25 × 14 =
6. 6.19 × 14 =
7. 7.34 × 15 =
8. 8.19 × 12 =
9. 9.35 × 14 =
10. 10.32 × 14 =
11. 11.20 × 12 =
12. 12.34 × 14 =
13. 13.13 × 16 =
14. 14.22 × 15 =
15. 15.26 × 15 =
16. 16.30 × 16 =
17. 17.18 × 14 =
18. 18.29 × 15 =
19. 19.28 × 12 =
20. 20.30 × 12 =
21. 21.49 × 15 =
22. 22.28 × 15 =
23. 23.42 × 14 =
24. 24.22 × 18 =
25. 25.29 × 14 =
26. 26.20 × 14 =
27. 27.30 × 18 =
28. 28.11 × 14 =
29. 29.32 × 24 =
30. 30.31 × 16 =
31. 31.30 × 14 =
32. 32.25 × 24 =
33. 33.27 × 18 =
34. 34.20 × 15 =
35. 35.27 × 24 =
36. 36.12 × 12 =
37. 37.43 × 24 =
38. 38.32 × 15 =
39. 39.21 × 16 =
40. 40.25 × 12 =

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