Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 705 · 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. 1.12 × 24 =
2. 2.13 × 15 =
3. 3.33 × 18 =
4. 4.29 × 16 =
5. 5.48 × 15 =
6. 6.22 × 16 =
7. 7.18 × 15 =
8. 8.33 × 16 =
9. 9.19 × 12 =
10. 10.19 × 16 =
11. 11.41 × 12 =
12. 12.20 × 14 =
13. 13.16 × 24 =
14. 14.25 × 14 =
15. 15.49 × 14 =
16. 16.11 × 14 =
17. 17.17 × 14 =
18. 18.45 × 18 =
19. 19.43 × 24 =
20. 20.21 × 15 =
21. 21.38 × 14 =
22. 22.31 × 14 =
23. 23.49 × 15 =
24. 24.26 × 12 =
25. 25.32 × 16 =
26. 26.22 × 18 =
27. 27.20 × 18 =
28. 28.14 × 14 =
29. 29.37 × 15 =
30. 30.32 × 12 =
31. 31.18 × 14 =
32. 32.16 × 14 =
33. 33.44 × 12 =
34. 34.11 × 12 =
35. 35.15 × 15 =
36. 36.30 × 15 =
37. 37.27 × 14 =
38. 38.44 × 15 =
39. 39.12 × 15 =
40. 40.20 × 16 =

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