Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 297 · 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. 1.39 × 18 =
2. 2.34 × 16 =
3. 3.41 × 16 =
4. 4.24 × 15 =
5. 5.18 × 15 =
6. 6.20 × 12 =
7. 7.33 × 16 =
8. 8.25 × 12 =
9. 9.19 × 24 =
10. 10.20 × 24 =
11. 11.42 × 18 =
12. 12.17 × 18 =
13. 13.41 × 24 =
14. 14.49 × 15 =
15. 15.23 × 12 =
16. 16.29 × 14 =
17. 17.14 × 18 =
18. 18.28 × 24 =
19. 19.27 × 16 =
20. 20.44 × 18 =
21. 21.18 × 12 =
22. 22.35 × 18 =
23. 23.26 × 14 =
24. 24.38 × 16 =
25. 25.29 × 18 =
26. 26.25 × 16 =
27. 27.48 × 24 =
28. 28.45 × 18 =
29. 29.39 × 14 =
30. 30.36 × 12 =
31. 31.18 × 16 =
32. 32.34 × 15 =
33. 33.22 × 15 =
34. 34.26 × 15 =
35. 35.44 × 12 =
36. 36.21 × 24 =
37. 37.28 × 14 =
38. 38.34 × 14 =
39. 39.37 × 15 =
40. 40.30 × 24 =

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