Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 546 · 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. 1.41 × 14 =
2. 2.18 × 12 =
3. 3.26 × 15 =
4. 4.44 × 24 =
5. 5.30 × 12 =
6. 6.28 × 14 =
7. 7.48 × 24 =
8. 8.16 × 16 =
9. 9.48 × 12 =
10. 10.17 × 18 =
11. 11.49 × 24 =
12. 12.46 × 12 =
13. 13.26 × 14 =
14. 14.36 × 18 =
15. 15.27 × 12 =
16. 16.31 × 18 =
17. 17.40 × 12 =
18. 18.21 × 12 =
19. 19.29 × 24 =
20. 20.24 × 14 =
21. 21.11 × 15 =
22. 22.47 × 18 =
23. 23.36 × 12 =
24. 24.15 × 16 =
25. 25.48 × 16 =
26. 26.19 × 18 =
27. 27.11 × 14 =
28. 28.16 × 15 =
29. 29.33 × 16 =
30. 30.12 × 16 =
31. 31.14 × 15 =
32. 32.39 × 12 =
33. 33.49 × 12 =
34. 34.33 × 24 =
35. 35.23 × 18 =
36. 36.29 × 18 =
37. 37.37 × 16 =
38. 38.21 × 24 =
39. 39.21 × 14 =
40. 40.15 × 14 =

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