Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 460 · 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 × 15 =
2. 2.40 × 12 =
3. 3.17 × 18 =
4. 4.49 × 24 =
5. 5.19 × 14 =
6. 6.20 × 14 =
7. 7.19 × 18 =
8. 8.17 × 16 =
9. 9.42 × 18 =
10. 10.37 × 24 =
11. 11.36 × 15 =
12. 12.23 × 12 =
13. 13.18 × 16 =
14. 14.40 × 24 =
15. 15.49 × 18 =
16. 16.14 × 16 =
17. 17.22 × 24 =
18. 18.27 × 15 =
19. 19.48 × 24 =
20. 20.29 × 24 =
21. 21.34 × 24 =
22. 22.17 × 14 =
23. 23.36 × 24 =
24. 24.29 × 14 =
25. 25.14 × 12 =
26. 26.43 × 24 =
27. 27.25 × 14 =
28. 28.36 × 16 =
29. 29.44 × 15 =
30. 30.34 × 14 =
31. 31.31 × 15 =
32. 32.32 × 14 =
33. 33.36 × 12 =
34. 34.34 × 16 =
35. 35.46 × 18 =
36. 36.25 × 18 =
37. 37.27 × 24 =
38. 38.38 × 14 =
39. 39.20 × 15 =
40. 40.27 × 14 =

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