Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 294 · 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 × 15 =
2. 2.39 × 24 =
3. 3.49 × 15 =
4. 4.23 × 15 =
5. 5.34 × 15 =
6. 6.37 × 18 =
7. 7.35 × 12 =
8. 8.37 × 14 =
9. 9.44 × 12 =
10. 10.12 × 14 =
11. 11.32 × 16 =
12. 12.49 × 16 =
13. 13.27 × 12 =
14. 14.43 × 24 =
15. 15.44 × 24 =
16. 16.31 × 15 =
17. 17.48 × 24 =
18. 18.46 × 16 =
19. 19.24 × 15 =
20. 20.13 × 24 =
21. 21.22 × 24 =
22. 22.35 × 24 =
23. 23.15 × 12 =
24. 24.22 × 12 =
25. 25.27 × 18 =
26. 26.16 × 24 =
27. 27.18 × 14 =
28. 28.34 × 24 =
29. 29.15 × 14 =
30. 30.31 × 14 =
31. 31.19 × 12 =
32. 32.17 × 14 =
33. 33.14 × 18 =
34. 34.28 × 24 =
35. 35.16 × 14 =
36. 36.46 × 18 =
37. 37.16 × 18 =
38. 38.41 × 12 =
39. 39.17 × 18 =
40. 40.34 × 16 =

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