Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 319 · 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. 1.20 × 18 =
2. 2.25 × 15 =
3. 3.24 × 12 =
4. 4.18 × 16 =
5. 5.36 × 12 =
6. 6.44 × 15 =
7. 7.31 × 18 =
8. 8.27 × 15 =
9. 9.43 × 18 =
10. 10.34 × 15 =
11. 11.38 × 24 =
12. 12.13 × 18 =
13. 13.18 × 14 =
14. 14.21 × 24 =
15. 15.12 × 16 =
16. 16.34 × 24 =
17. 17.15 × 18 =
18. 18.20 × 16 =
19. 19.20 × 15 =
20. 20.22 × 18 =
21. 21.26 × 24 =
22. 22.44 × 14 =
23. 23.33 × 15 =
24. 24.30 × 18 =
25. 25.11 × 24 =
26. 26.41 × 15 =
27. 27.24 × 15 =
28. 28.21 × 16 =
29. 29.22 × 14 =
30. 30.28 × 18 =
31. 31.27 × 16 =
32. 32.25 × 14 =
33. 33.29 × 18 =
34. 34.32 × 15 =
35. 35.16 × 15 =
36. 36.23 × 18 =
37. 37.49 × 14 =
38. 38.34 × 14 =
39. 39.35 × 18 =
40. 40.41 × 24 =

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