Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 589 · 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. 1.49 × 16 =
2. 2.40 × 15 =
3. 3.19 × 16 =
4. 4.27 × 16 =
5. 5.15 × 18 =
6. 6.38 × 16 =
7. 7.26 × 12 =
8. 8.33 × 24 =
9. 9.17 × 12 =
10. 10.23 × 18 =
11. 11.24 × 14 =
12. 12.12 × 18 =
13. 13.48 × 12 =
14. 14.21 × 16 =
15. 15.24 × 12 =
16. 16.14 × 14 =
17. 17.26 × 24 =
18. 18.18 × 14 =
19. 19.46 × 24 =
20. 20.32 × 16 =
21. 21.37 × 14 =
22. 22.32 × 14 =
23. 23.18 × 24 =
24. 24.11 × 14 =
25. 25.14 × 16 =
26. 26.43 × 24 =
27. 27.14 × 12 =
28. 28.18 × 16 =
29. 29.49 × 18 =
30. 30.44 × 18 =
31. 31.15 × 24 =
32. 32.47 × 15 =
33. 33.24 × 15 =
34. 34.27 × 15 =
35. 35.28 × 16 =
36. 36.35 × 16 =
37. 37.23 × 12 =
38. 38.13 × 14 =
39. 39.37 × 18 =
40. 40.14 × 15 =

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