Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 583 · 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 × 15 =
2. 2.29 × 24 =
3. 3.26 × 15 =
4. 4.19 × 16 =
5. 5.27 × 15 =
6. 6.25 × 18 =
7. 7.31 × 12 =
8. 8.24 × 18 =
9. 9.31 × 16 =
10. 10.20 × 12 =
11. 11.32 × 16 =
12. 12.26 × 12 =
13. 13.23 × 15 =
14. 14.12 × 18 =
15. 15.40 × 15 =
16. 16.16 × 18 =
17. 17.33 × 24 =
18. 18.22 × 12 =
19. 19.12 × 16 =
20. 20.11 × 12 =
21. 21.24 × 15 =
22. 22.34 × 15 =
23. 23.17 × 24 =
24. 24.47 × 18 =
25. 25.35 × 16 =
26. 26.49 × 24 =
27. 27.32 × 12 =
28. 28.25 × 24 =
29. 29.13 × 14 =
30. 30.43 × 15 =
31. 31.45 × 15 =
32. 32.44 × 14 =
33. 33.34 × 14 =
34. 34.23 × 14 =
35. 35.21 × 16 =
36. 36.31 × 24 =
37. 37.29 × 18 =
38. 38.12 × 24 =
39. 39.16 × 14 =
40. 40.12 × 12 =

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