Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 244 · 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. 1.30 × 14 =
2. 2.22 × 12 =
3. 3.26 × 12 =
4. 4.46 × 15 =
5. 5.22 × 14 =
6. 6.14 × 15 =
7. 7.33 × 18 =
8. 8.19 × 15 =
9. 9.26 × 16 =
10. 10.19 × 16 =
11. 11.15 × 14 =
12. 12.34 × 12 =
13. 13.17 × 18 =
14. 14.28 × 15 =
15. 15.16 × 16 =
16. 16.45 × 15 =
17. 17.40 × 12 =
18. 18.45 × 18 =
19. 19.38 × 15 =
20. 20.48 × 24 =
21. 21.19 × 24 =
22. 22.23 × 12 =
23. 23.18 × 12 =
24. 24.36 × 14 =
25. 25.32 × 16 =
26. 26.37 × 16 =
27. 27.39 × 16 =
28. 28.23 × 18 =
29. 29.18 × 14 =
30. 30.14 × 16 =
31. 31.39 × 14 =
32. 32.38 × 16 =
33. 33.11 × 15 =
34. 34.23 × 15 =
35. 35.44 × 12 =
36. 36.36 × 18 =
37. 37.38 × 18 =
38. 38.25 × 16 =
39. 39.29 × 24 =
40. 40.40 × 18 =

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