Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 250 · 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. 1.27 × 24 =
2. 2.34 × 15 =
3. 3.15 × 12 =
4. 4.20 × 18 =
5. 5.14 × 24 =
6. 6.28 × 24 =
7. 7.16 × 24 =
8. 8.40 × 16 =
9. 9.33 × 16 =
10. 10.14 × 12 =
11. 11.27 × 15 =
12. 12.34 × 14 =
13. 13.43 × 24 =
14. 14.18 × 14 =
15. 15.18 × 15 =
16. 16.35 × 16 =
17. 17.44 × 24 =
18. 18.19 × 16 =
19. 19.41 × 18 =
20. 20.31 × 15 =
21. 21.16 × 14 =
22. 22.38 × 24 =
23. 23.46 × 12 =
24. 24.36 × 15 =
25. 25.36 × 24 =
26. 26.24 × 18 =
27. 27.28 × 12 =
28. 28.45 × 15 =
29. 29.18 × 16 =
30. 30.13 × 14 =
31. 31.16 × 12 =
32. 32.20 × 12 =
33. 33.15 × 16 =
34. 34.20 × 24 =
35. 35.32 × 18 =
36. 36.31 × 16 =
37. 37.38 × 15 =
38. 38.25 × 18 =
39. 39.22 × 24 =
40. 40.17 × 12 =

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