Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 370 · 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. 1.45 × 24 =
2. 2.33 × 15 =
3. 3.45 × 18 =
4. 4.19 × 15 =
5. 5.14 × 14 =
6. 6.14 × 24 =
7. 7.23 × 14 =
8. 8.22 × 16 =
9. 9.14 × 15 =
10. 10.12 × 12 =
11. 11.33 × 12 =
12. 12.26 × 12 =
13. 13.23 × 15 =
14. 14.20 × 12 =
15. 15.19 × 14 =
16. 16.11 × 18 =
17. 17.33 × 24 =
18. 18.42 × 14 =
19. 19.30 × 14 =
20. 20.46 × 12 =
21. 21.12 × 18 =
22. 22.41 × 18 =
23. 23.47 × 14 =
24. 24.15 × 12 =
25. 25.31 × 16 =
26. 26.40 × 16 =
27. 27.41 × 15 =
28. 28.43 × 14 =
29. 29.30 × 18 =
30. 30.37 × 12 =
31. 31.46 × 15 =
32. 32.36 × 16 =
33. 33.38 × 12 =
34. 34.39 × 14 =
35. 35.35 × 16 =
36. 36.24 × 12 =
37. 37.43 × 15 =
38. 38.13 × 14 =
39. 39.20 × 18 =
40. 40.38 × 24 =

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