Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 462 · 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. 1.48 × 18 =
2. 2.34 × 24 =
3. 3.37 × 24 =
4. 4.14 × 15 =
5. 5.13 × 18 =
6. 6.13 × 24 =
7. 7.40 × 14 =
8. 8.20 × 14 =
9. 9.35 × 12 =
10. 10.12 × 18 =
11. 11.35 × 14 =
12. 12.13 × 15 =
13. 13.44 × 18 =
14. 14.27 × 16 =
15. 15.40 × 16 =
16. 16.43 × 18 =
17. 17.29 × 18 =
18. 18.45 × 18 =
19. 19.42 × 12 =
20. 20.32 × 24 =
21. 21.42 × 18 =
22. 22.39 × 14 =
23. 23.21 × 24 =
24. 24.45 × 14 =
25. 25.28 × 16 =
26. 26.31 × 15 =
27. 27.30 × 14 =
28. 28.49 × 12 =
29. 29.18 × 24 =
30. 30.44 × 12 =
31. 31.29 × 14 =
32. 32.23 × 24 =
33. 33.45 × 24 =
34. 34.28 × 24 =
35. 35.12 × 12 =
36. 36.31 × 18 =
37. 37.12 × 24 =
38. 38.15 × 15 =
39. 39.26 × 12 =
40. 40.43 × 16 =

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