Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 256 · 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. 1.15 × 24 =
2. 2.32 × 16 =
3. 3.12 × 18 =
4. 4.34 × 12 =
5. 5.43 × 24 =
6. 6.32 × 14 =
7. 7.11 × 16 =
8. 8.22 × 16 =
9. 9.19 × 15 =
10. 10.44 × 18 =
11. 11.45 × 15 =
12. 12.21 × 12 =
13. 13.41 × 16 =
14. 14.24 × 12 =
15. 15.20 × 24 =
16. 16.11 × 18 =
17. 17.11 × 14 =
18. 18.23 × 18 =
19. 19.21 × 15 =
20. 20.48 × 24 =
21. 21.44 × 16 =
22. 22.29 × 12 =
23. 23.33 × 14 =
24. 24.12 × 12 =
25. 25.29 × 18 =
26. 26.18 × 24 =
27. 27.36 × 16 =
28. 28.12 × 14 =
29. 29.28 × 18 =
30. 30.32 × 12 =
31. 31.23 × 24 =
32. 32.37 × 18 =
33. 33.41 × 24 =
34. 34.37 × 14 =
35. 35.40 × 24 =
36. 36.48 × 12 =
37. 37.14 × 14 =
38. 38.34 × 16 =
39. 39.34 × 24 =
40. 40.15 × 15 =

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