Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 324 · 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. 1.43 × 14 =
2. 2.49 × 18 =
3. 3.21 × 12 =
4. 4.23 × 16 =
5. 5.47 × 14 =
6. 6.13 × 15 =
7. 7.23 × 15 =
8. 8.48 × 12 =
9. 9.18 × 16 =
10. 10.20 × 18 =
11. 11.23 × 12 =
12. 12.15 × 24 =
13. 13.42 × 18 =
14. 14.26 × 15 =
15. 15.43 × 12 =
16. 16.43 × 18 =
17. 17.13 × 16 =
18. 18.42 × 24 =
19. 19.12 × 12 =
20. 20.18 × 14 =
21. 21.17 × 14 =
22. 22.14 × 14 =
23. 23.34 × 12 =
24. 24.44 × 12 =
25. 25.36 × 18 =
26. 26.16 × 18 =
27. 27.29 × 24 =
28. 28.17 × 24 =
29. 29.27 × 24 =
30. 30.26 × 12 =
31. 31.15 × 18 =
32. 32.46 × 14 =
33. 33.35 × 15 =
34. 34.22 × 24 =
35. 35.48 × 18 =
36. 36.21 × 15 =
37. 37.18 × 15 =
38. 38.28 × 16 =
39. 39.41 × 14 =
40. 40.17 × 16 =

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