Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 497 · 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. 1.28 × 14 =
2. 2.20 × 18 =
3. 3.34 × 14 =
4. 4.26 × 24 =
5. 5.34 × 16 =
6. 6.22 × 18 =
7. 7.13 × 18 =
8. 8.49 × 14 =
9. 9.29 × 24 =
10. 10.17 × 18 =
11. 11.38 × 15 =
12. 12.13 × 14 =
13. 13.30 × 15 =
14. 14.23 × 24 =
15. 15.21 × 12 =
16. 16.42 × 24 =
17. 17.15 × 18 =
18. 18.30 × 18 =
19. 19.11 × 24 =
20. 20.19 × 16 =
21. 21.20 × 14 =
22. 22.20 × 16 =
23. 23.25 × 14 =
24. 24.38 × 18 =
25. 25.29 × 14 =
26. 26.43 × 12 =
27. 27.31 × 24 =
28. 28.34 × 18 =
29. 29.12 × 15 =
30. 30.30 × 24 =
31. 31.22 × 14 =
32. 32.21 × 24 =
33. 33.38 × 16 =
34. 34.34 × 12 =
35. 35.45 × 15 =
36. 36.21 × 18 =
37. 37.46 × 15 =
38. 38.40 × 14 =
39. 39.36 × 14 =
40. 40.45 × 12 =

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