Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 624 · 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. 1.21 × 18 =
2. 2.20 × 12 =
3. 3.18 × 15 =
4. 4.44 × 14 =
5. 5.29 × 16 =
6. 6.15 × 18 =
7. 7.46 × 12 =
8. 8.25 × 14 =
9. 9.48 × 16 =
10. 10.11 × 16 =
11. 11.47 × 24 =
12. 12.33 × 16 =
13. 13.14 × 16 =
14. 14.29 × 14 =
15. 15.21 × 16 =
16. 16.18 × 24 =
17. 17.19 × 15 =
18. 18.11 × 18 =
19. 19.49 × 15 =
20. 20.30 × 12 =
21. 21.12 × 14 =
22. 22.12 × 24 =
23. 23.17 × 12 =
24. 24.27 × 18 =
25. 25.29 × 18 =
26. 26.24 × 12 =
27. 27.49 × 14 =
28. 28.40 × 12 =
29. 29.14 × 14 =
30. 30.40 × 24 =
31. 31.38 × 14 =
32. 32.23 × 24 =
33. 33.35 × 24 =
34. 34.45 × 14 =
35. 35.37 × 18 =
36. 36.16 × 14 =
37. 37.41 × 15 =
38. 38.32 × 12 =
39. 39.28 × 15 =
40. 40.13 × 24 =

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