Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 329 · 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. 1.18 × 24 =
2. 2.45 × 24 =
3. 3.34 × 18 =
4. 4.40 × 18 =
5. 5.20 × 15 =
6. 6.17 × 12 =
7. 7.37 × 16 =
8. 8.14 × 12 =
9. 9.26 × 15 =
10. 10.26 × 24 =
11. 11.29 × 12 =
12. 12.40 × 14 =
13. 13.21 × 14 =
14. 14.26 × 14 =
15. 15.49 × 14 =
16. 16.20 × 18 =
17. 17.32 × 16 =
18. 18.23 × 12 =
19. 19.40 × 16 =
20. 20.12 × 16 =
21. 21.28 × 12 =
22. 22.38 × 15 =
23. 23.32 × 14 =
24. 24.16 × 16 =
25. 25.19 × 15 =
26. 26.40 × 24 =
27. 27.43 × 14 =
28. 28.13 × 18 =
29. 29.11 × 14 =
30. 30.41 × 14 =
31. 31.25 × 15 =
32. 32.19 × 16 =
33. 33.40 × 15 =
34. 34.16 × 12 =
35. 35.49 × 24 =
36. 36.37 × 15 =
37. 37.30 × 16 =
38. 38.16 × 18 =
39. 39.15 × 18 =
40. 40.31 × 14 =

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