Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 298 · 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. 1.11 × 15 =
2. 2.31 × 24 =
3. 3.22 × 12 =
4. 4.38 × 14 =
5. 5.11 × 12 =
6. 6.23 × 15 =
7. 7.44 × 18 =
8. 8.14 × 15 =
9. 9.35 × 12 =
10. 10.14 × 18 =
11. 11.15 × 15 =
12. 12.34 × 24 =
13. 13.13 × 14 =
14. 14.29 × 24 =
15. 15.49 × 24 =
16. 16.16 × 16 =
17. 17.12 × 16 =
18. 18.12 × 14 =
19. 19.38 × 15 =
20. 20.47 × 16 =
21. 21.19 × 15 =
22. 22.30 × 12 =
23. 23.31 × 15 =
24. 24.16 × 18 =
25. 25.19 × 12 =
26. 26.23 × 18 =
27. 27.18 × 14 =
28. 28.34 × 15 =
29. 29.49 × 12 =
30. 30.36 × 15 =
31. 31.37 × 12 =
32. 32.25 × 16 =
33. 33.17 × 12 =
34. 34.35 × 16 =
35. 35.37 × 18 =
36. 36.15 × 12 =
37. 37.44 × 14 =
38. 38.48 × 24 =
39. 39.24 × 14 =
40. 40.13 × 12 =

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