Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 855 · 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. 1.44 × 24 =
2. 2.14 × 12 =
3. 3.11 × 15 =
4. 4.46 × 24 =
5. 5.15 × 12 =
6. 6.35 × 16 =
7. 7.23 × 16 =
8. 8.31 × 16 =
9. 9.20 × 24 =
10. 10.13 × 16 =
11. 11.18 × 15 =
12. 12.42 × 18 =
13. 13.11 × 16 =
14. 14.27 × 14 =
15. 15.27 × 18 =
16. 16.41 × 14 =
17. 17.45 × 16 =
18. 18.14 × 15 =
19. 19.16 × 24 =
20. 20.36 × 14 =
21. 21.19 × 16 =
22. 22.11 × 24 =
23. 23.29 × 24 =
24. 24.34 × 12 =
25. 25.12 × 14 =
26. 26.49 × 14 =
27. 27.31 × 15 =
28. 28.41 × 12 =
29. 29.28 × 12 =
30. 30.35 × 18 =
31. 31.26 × 12 =
32. 32.19 × 15 =
33. 33.12 × 16 =
34. 34.41 × 24 =
35. 35.43 × 16 =
36. 36.39 × 18 =
37. 37.31 × 18 =
38. 38.38 × 14 =
39. 39.18 × 16 =
40. 40.49 × 15 =

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