Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 890 · 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 × 12 =
2. 2.22 × 24 =
3. 3.24 × 24 =
4. 4.31 × 12 =
5. 5.37 × 12 =
6. 6.32 × 15 =
7. 7.19 × 15 =
8. 8.36 × 12 =
9. 9.47 × 12 =
10. 10.15 × 24 =
11. 11.42 × 24 =
12. 12.12 × 16 =
13. 13.30 × 14 =
14. 14.20 × 24 =
15. 15.25 × 16 =
16. 16.38 × 15 =
17. 17.43 × 16 =
18. 18.48 × 24 =
19. 19.22 × 15 =
20. 20.42 × 12 =
21. 21.41 × 18 =
22. 22.34 × 16 =
23. 23.30 × 16 =
24. 24.14 × 24 =
25. 25.11 × 14 =
26. 26.27 × 16 =
27. 27.17 × 16 =
28. 28.36 × 24 =
29. 29.18 × 18 =
30. 30.17 × 14 =
31. 31.40 × 12 =
32. 32.15 × 14 =
33. 33.15 × 16 =
34. 34.12 × 15 =
35. 35.42 × 18 =
36. 36.37 × 15 =
37. 37.35 × 12 =
38. 38.32 × 24 =
39. 39.40 × 18 =
40. 40.46 × 24 =

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