Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 698 · 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. 1.42 × 24 =
2. 2.38 × 16 =
3. 3.30 × 14 =
4. 4.24 × 24 =
5. 5.39 × 12 =
6. 6.46 × 12 =
7. 7.43 × 16 =
8. 8.26 × 14 =
9. 9.44 × 18 =
10. 10.37 × 14 =
11. 11.24 × 15 =
12. 12.16 × 12 =
13. 13.32 × 15 =
14. 14.16 × 16 =
15. 15.15 × 15 =
16. 16.45 × 16 =
17. 17.25 × 12 =
18. 18.47 × 16 =
19. 19.12 × 16 =
20. 20.43 × 15 =
21. 21.15 × 14 =
22. 22.15 × 24 =
23. 23.12 × 15 =
24. 24.21 × 15 =
25. 25.29 × 14 =
26. 26.14 × 18 =
27. 27.37 × 16 =
28. 28.43 × 12 =
29. 29.16 × 15 =
30. 30.24 × 16 =
31. 31.22 × 12 =
32. 32.43 × 18 =
33. 33.28 × 14 =
34. 34.19 × 12 =
35. 35.14 × 15 =
36. 36.37 × 12 =
37. 37.19 × 14 =
38. 38.18 × 12 =
39. 39.21 × 14 =
40. 40.48 × 14 =

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