Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 893 · 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. 1.22 × 18 =
2. 2.11 × 24 =
3. 3.45 × 16 =
4. 4.15 × 24 =
5. 5.29 × 16 =
6. 6.18 × 18 =
7. 7.35 × 24 =
8. 8.44 × 14 =
9. 9.30 × 15 =
10. 10.12 × 14 =
11. 11.21 × 15 =
12. 12.35 × 14 =
13. 13.22 × 16 =
14. 14.36 × 18 =
15. 15.38 × 15 =
16. 16.18 × 14 =
17. 17.17 × 18 =
18. 18.33 × 18 =
19. 19.23 × 18 =
20. 20.42 × 15 =
21. 21.31 × 12 =
22. 22.36 × 15 =
23. 23.36 × 14 =
24. 24.47 × 12 =
25. 25.11 × 14 =
26. 26.32 × 18 =
27. 27.27 × 14 =
28. 28.30 × 12 =
29. 29.49 × 16 =
30. 30.46 × 14 =
31. 31.25 × 12 =
32. 32.17 × 15 =
33. 33.18 × 16 =
34. 34.12 × 15 =
35. 35.20 × 18 =
36. 36.35 × 15 =
37. 37.37 × 16 =
38. 38.20 × 12 =
39. 39.39 × 12 =
40. 40.42 × 24 =

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