Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 451 · 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. 1.34 × 16 =
2. 2.27 × 15 =
3. 3.19 × 12 =
4. 4.38 × 16 =
5. 5.17 × 16 =
6. 6.38 × 14 =
7. 7.35 × 12 =
8. 8.13 × 16 =
9. 9.28 × 18 =
10. 10.13 × 14 =
11. 11.48 × 18 =
12. 12.29 × 12 =
13. 13.28 × 15 =
14. 14.46 × 12 =
15. 15.47 × 18 =
16. 16.39 × 15 =
17. 17.30 × 18 =
18. 18.48 × 14 =
19. 19.18 × 15 =
20. 20.19 × 24 =
21. 21.41 × 12 =
22. 22.48 × 12 =
23. 23.41 × 14 =
24. 24.49 × 14 =
25. 25.15 × 12 =
26. 26.22 × 15 =
27. 27.22 × 16 =
28. 28.36 × 15 =
29. 29.40 × 24 =
30. 30.36 × 12 =
31. 31.22 × 14 =
32. 32.24 × 18 =
33. 33.11 × 24 =
34. 34.47 × 24 =
35. 35.37 × 24 =
36. 36.18 × 14 =
37. 37.30 × 12 =
38. 38.23 × 14 =
39. 39.43 × 15 =
40. 40.30 × 16 =

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