Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 941 · 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. 1.29 × 18 =
2. 2.16 × 24 =
3. 3.49 × 15 =
4. 4.15 × 24 =
5. 5.43 × 24 =
6. 6.27 × 15 =
7. 7.13 × 24 =
8. 8.48 × 18 =
9. 9.25 × 18 =
10. 10.31 × 14 =
11. 11.29 × 12 =
12. 12.45 × 16 =
13. 13.17 × 12 =
14. 14.25 × 12 =
15. 15.38 × 15 =
16. 16.13 × 15 =
17. 17.11 × 18 =
18. 18.27 × 12 =
19. 19.19 × 16 =
20. 20.27 × 18 =
21. 21.15 × 15 =
22. 22.44 × 24 =
23. 23.32 × 12 =
24. 24.20 × 14 =
25. 25.18 × 15 =
26. 26.44 × 12 =
27. 27.35 × 15 =
28. 28.43 × 18 =
29. 29.30 × 24 =
30. 30.45 × 15 =
31. 31.33 × 16 =
32. 32.14 × 15 =
33. 33.11 × 16 =
34. 34.34 × 24 =
35. 35.45 × 14 =
36. 36.18 × 14 =
37. 37.17 × 24 =
38. 38.40 × 14 =
39. 39.46 × 24 =
40. 40.20 × 24 =

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