Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 572 · 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. 1.14 × 24 =
2. 2.39 × 14 =
3. 3.38 × 14 =
4. 4.20 × 24 =
5. 5.15 × 16 =
6. 6.19 × 16 =
7. 7.46 × 14 =
8. 8.32 × 16 =
9. 9.35 × 15 =
10. 10.19 × 12 =
11. 11.14 × 15 =
12. 12.43 × 12 =
13. 13.27 × 16 =
14. 14.29 × 18 =
15. 15.35 × 18 =
16. 16.47 × 16 =
17. 17.12 × 14 =
18. 18.15 × 14 =
19. 19.44 × 24 =
20. 20.20 × 15 =
21. 21.42 × 14 =
22. 22.49 × 24 =
23. 23.15 × 12 =
24. 24.35 × 14 =
25. 25.13 × 12 =
26. 26.48 × 24 =
27. 27.43 × 18 =
28. 28.45 × 18 =
29. 29.11 × 24 =
30. 30.11 × 14 =
31. 31.13 × 24 =
32. 32.30 × 15 =
33. 33.40 × 15 =
34. 34.45 × 15 =
35. 35.40 × 14 =
36. 36.26 × 24 =
37. 37.44 × 16 =
38. 38.12 × 18 =
39. 39.18 × 14 =
40. 40.16 × 24 =

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