Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 100 · 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 × 24 =
2. 2.30 × 12 =
3. 3.15 × 18 =
4. 4.34 × 24 =
5. 5.18 × 16 =
6. 6.29 × 18 =
7. 7.37 × 18 =
8. 8.45 × 14 =
9. 9.22 × 24 =
10. 10.18 × 14 =
11. 11.34 × 18 =
12. 12.22 × 12 =
13. 13.24 × 15 =
14. 14.16 × 24 =
15. 15.27 × 16 =
16. 16.31 × 15 =
17. 17.39 × 18 =
18. 18.38 × 24 =
19. 19.20 × 12 =
20. 20.13 × 14 =
21. 21.41 × 24 =
22. 22.28 × 24 =
23. 23.26 × 16 =
24. 24.21 × 12 =
25. 25.20 × 14 =
26. 26.12 × 24 =
27. 27.15 × 12 =
28. 28.43 × 12 =
29. 29.12 × 15 =
30. 30.15 × 15 =
31. 31.39 × 12 =
32. 32.12 × 18 =
33. 33.39 × 24 =
34. 34.33 × 16 =
35. 35.22 × 16 =
36. 36.41 × 12 =
37. 37.43 × 24 =
38. 38.25 × 12 =
39. 39.47 × 12 =
40. 40.28 × 14 =

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