Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 208 · 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. 1.43 × 12 =
2. 2.49 × 16 =
3. 3.14 × 18 =
4. 4.30 × 15 =
5. 5.25 × 24 =
6. 6.13 × 14 =
7. 7.34 × 18 =
8. 8.42 × 24 =
9. 9.43 × 14 =
10. 10.48 × 18 =
11. 11.41 × 16 =
12. 12.49 × 15 =
13. 13.34 × 16 =
14. 14.38 × 18 =
15. 15.39 × 24 =
16. 16.38 × 16 =
17. 17.45 × 14 =
18. 18.47 × 14 =
19. 19.45 × 16 =
20. 20.26 × 18 =
21. 21.31 × 16 =
22. 22.32 × 24 =
23. 23.27 × 15 =
24. 24.48 × 14 =
25. 25.28 × 15 =
26. 26.13 × 12 =
27. 27.13 × 15 =
28. 28.25 × 14 =
29. 29.20 × 12 =
30. 30.33 × 24 =
31. 31.29 × 14 =
32. 32.36 × 18 =
33. 33.12 × 15 =
34. 34.15 × 15 =
35. 35.14 × 24 =
36. 36.16 × 24 =
37. 37.11 × 24 =
38. 38.41 × 12 =
39. 39.13 × 18 =
40. 40.19 × 12 =

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