Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 384 · 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. 1.22 × 24 =
2. 2.23 × 24 =
3. 3.43 × 15 =
4. 4.26 × 12 =
5. 5.19 × 15 =
6. 6.17 × 12 =
7. 7.23 × 16 =
8. 8.41 × 16 =
9. 9.29 × 24 =
10. 10.40 × 15 =
11. 11.27 × 18 =
12. 12.41 × 18 =
13. 13.12 × 15 =
14. 14.44 × 16 =
15. 15.48 × 15 =
16. 16.33 × 18 =
17. 17.42 × 15 =
18. 18.30 × 14 =
19. 19.28 × 12 =
20. 20.27 × 24 =
21. 21.22 × 16 =
22. 22.26 × 15 =
23. 23.24 × 12 =
24. 24.25 × 15 =
25. 25.20 × 16 =
26. 26.26 × 16 =
27. 27.19 × 16 =
28. 28.34 × 14 =
29. 29.46 × 15 =
30. 30.21 × 12 =
31. 31.18 × 12 =
32. 32.49 × 14 =
33. 33.47 × 15 =
34. 34.29 × 12 =
35. 35.23 × 12 =
36. 36.49 × 12 =
37. 37.44 × 12 =
38. 38.43 × 12 =
39. 39.42 × 14 =
40. 40.41 × 14 =

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