Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 581 · 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. 1.41 × 16 =
2. 2.29 × 16 =
3. 3.20 × 12 =
4. 4.33 × 12 =
5. 5.19 × 15 =
6. 6.16 × 16 =
7. 7.27 × 15 =
8. 8.25 × 15 =
9. 9.32 × 18 =
10. 10.36 × 14 =
11. 11.45 × 18 =
12. 12.14 × 12 =
13. 13.49 × 18 =
14. 14.27 × 24 =
15. 15.25 × 16 =
16. 16.23 × 24 =
17. 17.15 × 12 =
18. 18.30 × 14 =
19. 19.41 × 14 =
20. 20.30 × 24 =
21. 21.19 × 24 =
22. 22.21 × 14 =
23. 23.31 × 18 =
24. 24.42 × 18 =
25. 25.20 × 14 =
26. 26.37 × 16 =
27. 27.37 × 24 =
28. 28.26 × 18 =
29. 29.27 × 12 =
30. 30.22 × 16 =
31. 31.34 × 16 =
32. 32.47 × 14 =
33. 33.16 × 15 =
34. 34.17 × 24 =
35. 35.48 × 14 =
36. 36.12 × 15 =
37. 37.22 × 14 =
38. 38.40 × 24 =
39. 39.15 × 16 =
40. 40.32 × 14 =

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