Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 695 · 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. 1.14 × 24 =
2. 2.37 × 18 =
3. 3.33 × 12 =
4. 4.46 × 12 =
5. 5.44 × 16 =
6. 6.48 × 12 =
7. 7.28 × 15 =
8. 8.37 × 15 =
9. 9.40 × 12 =
10. 10.47 × 14 =
11. 11.26 × 14 =
12. 12.41 × 12 =
13. 13.42 × 24 =
14. 14.12 × 24 =
15. 15.47 × 18 =
16. 16.19 × 14 =
17. 17.16 × 18 =
18. 18.45 × 18 =
19. 19.12 × 14 =
20. 20.27 × 18 =
21. 21.17 × 12 =
22. 22.41 × 15 =
23. 23.30 × 24 =
24. 24.38 × 18 =
25. 25.15 × 14 =
26. 26.35 × 24 =
27. 27.16 × 14 =
28. 28.19 × 24 =
29. 29.29 × 14 =
30. 30.27 × 24 =
31. 31.49 × 12 =
32. 32.14 × 14 =
33. 33.11 × 24 =
34. 34.33 × 14 =
35. 35.11 × 12 =
36. 36.20 × 12 =
37. 37.26 × 12 =
38. 38.48 × 16 =
39. 39.16 × 12 =
40. 40.49 × 18 =

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