Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 879 · 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. 1.25 × 24 =
2. 2.23 × 24 =
3. 3.12 × 24 =
4. 4.42 × 24 =
5. 5.35 × 24 =
6. 6.28 × 12 =
7. 7.34 × 16 =
8. 8.47 × 15 =
9. 9.12 × 12 =
10. 10.28 × 16 =
11. 11.34 × 24 =
12. 12.17 × 16 =
13. 13.43 × 15 =
14. 14.46 × 16 =
15. 15.29 × 14 =
16. 16.18 × 15 =
17. 17.13 × 12 =
18. 18.39 × 24 =
19. 19.25 × 18 =
20. 20.41 × 18 =
21. 21.41 × 24 =
22. 22.17 × 24 =
23. 23.45 × 12 =
24. 24.40 × 12 =
25. 25.29 × 15 =
26. 26.44 × 15 =
27. 27.38 × 16 =
28. 28.32 × 14 =
29. 29.48 × 12 =
30. 30.39 × 14 =
31. 31.19 × 14 =
32. 32.29 × 12 =
33. 33.41 × 16 =
34. 34.34 × 14 =
35. 35.31 × 16 =
36. 36.11 × 12 =
37. 37.32 × 12 =
38. 38.24 × 12 =
39. 39.44 × 24 =
40. 40.26 × 24 =

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