Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 809 · 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 × 18 =
2. 2.25 × 24 =
3. 3.23 × 14 =
4. 4.45 × 14 =
5. 5.34 × 24 =
6. 6.40 × 12 =
7. 7.34 × 12 =
8. 8.22 × 14 =
9. 9.23 × 15 =
10. 10.45 × 16 =
11. 11.31 × 14 =
12. 12.16 × 18 =
13. 13.18 × 14 =
14. 14.26 × 15 =
15. 15.19 × 15 =
16. 16.43 × 24 =
17. 17.25 × 15 =
18. 18.28 × 18 =
19. 19.44 × 15 =
20. 20.43 × 15 =
21. 21.47 × 15 =
22. 22.14 × 14 =
23. 23.37 × 16 =
24. 24.36 × 18 =
25. 25.28 × 24 =
26. 26.18 × 12 =
27. 27.22 × 12 =
28. 28.11 × 14 =
29. 29.26 × 12 =
30. 30.37 × 18 =
31. 31.21 × 16 =
32. 32.30 × 24 =
33. 33.22 × 24 =
34. 34.27 × 16 =
35. 35.34 × 15 =
36. 36.27 × 15 =
37. 37.38 × 24 =
38. 38.16 × 14 =
39. 39.36 × 15 =
40. 40.33 × 24 =

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