Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 651 · 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. 1.49 × 18 =
2. 2.11 × 24 =
3. 3.27 × 15 =
4. 4.34 × 16 =
5. 5.45 × 12 =
6. 6.22 × 14 =
7. 7.37 × 18 =
8. 8.49 × 12 =
9. 9.20 × 15 =
10. 10.23 × 24 =
11. 11.48 × 12 =
12. 12.27 × 14 =
13. 13.34 × 15 =
14. 14.13 × 16 =
15. 15.48 × 16 =
16. 16.19 × 12 =
17. 17.48 × 18 =
18. 18.29 × 18 =
19. 19.15 × 24 =
20. 20.35 × 14 =
21. 21.43 × 14 =
22. 22.24 × 12 =
23. 23.43 × 16 =
24. 24.25 × 15 =
25. 25.47 × 16 =
26. 26.13 × 15 =
27. 27.27 × 12 =
28. 28.16 × 15 =
29. 29.26 × 12 =
30. 30.12 × 18 =
31. 31.45 × 18 =
32. 32.17 × 12 =
33. 33.23 × 18 =
34. 34.22 × 15 =
35. 35.35 × 18 =
36. 36.42 × 18 =
37. 37.32 × 18 =
38. 38.14 × 24 =
39. 39.25 × 12 =
40. 40.11 × 18 =

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