Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 775 · 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. 1.46 × 15 =
2. 2.15 × 16 =
3. 3.18 × 15 =
4. 4.28 × 16 =
5. 5.34 × 24 =
6. 6.44 × 15 =
7. 7.43 × 14 =
8. 8.14 × 16 =
9. 9.34 × 16 =
10. 10.11 × 24 =
11. 11.43 × 18 =
12. 12.17 × 12 =
13. 13.44 × 12 =
14. 14.44 × 16 =
15. 15.12 × 12 =
16. 16.42 × 24 =
17. 17.37 × 16 =
18. 18.24 × 14 =
19. 19.34 × 18 =
20. 20.45 × 16 =
21. 21.46 × 24 =
22. 22.35 × 14 =
23. 23.41 × 14 =
24. 24.15 × 24 =
25. 25.29 × 15 =
26. 26.14 × 15 =
27. 27.45 × 24 =
28. 28.46 × 12 =
29. 29.47 × 14 =
30. 30.49 × 18 =
31. 31.16 × 24 =
32. 32.22 × 15 =
33. 33.39 × 24 =
34. 34.14 × 18 =
35. 35.17 × 14 =
36. 36.29 × 14 =
37. 37.48 × 14 =
38. 38.34 × 14 =
39. 39.13 × 15 =
40. 40.46 × 14 =

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