Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 477 · 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. 1.43 × 18 =
2. 2.25 × 16 =
3. 3.41 × 24 =
4. 4.46 × 16 =
5. 5.26 × 14 =
6. 6.44 × 16 =
7. 7.25 × 24 =
8. 8.27 × 14 =
9. 9.14 × 24 =
10. 10.42 × 15 =
11. 11.37 × 15 =
12. 12.24 × 16 =
13. 13.44 × 15 =
14. 14.13 × 18 =
15. 15.17 × 12 =
16. 16.39 × 12 =
17. 17.16 × 12 =
18. 18.27 × 18 =
19. 19.12 × 14 =
20. 20.25 × 15 =
21. 21.48 × 15 =
22. 22.27 × 15 =
23. 23.17 × 18 =
24. 24.28 × 24 =
25. 25.23 × 18 =
26. 26.19 × 12 =
27. 27.38 × 15 =
28. 28.14 × 14 =
29. 29.46 × 18 =
30. 30.15 × 15 =
31. 31.44 × 12 =
32. 32.19 × 15 =
33. 33.45 × 18 =
34. 34.11 × 15 =
35. 35.35 × 12 =
36. 36.38 × 24 =
37. 37.15 × 14 =
38. 38.14 × 12 =
39. 39.32 × 14 =
40. 40.20 × 15 =

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