Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 383 · 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. 1.18 × 16 =
2. 2.39 × 24 =
3. 3.13 × 16 =
4. 4.21 × 12 =
5. 5.41 × 15 =
6. 6.40 × 16 =
7. 7.26 × 14 =
8. 8.20 × 24 =
9. 9.19 × 24 =
10. 10.19 × 18 =
11. 11.12 × 24 =
12. 12.45 × 14 =
13. 13.24 × 14 =
14. 14.27 × 12 =
15. 15.15 × 18 =
16. 16.43 × 24 =
17. 17.49 × 16 =
18. 18.31 × 15 =
19. 19.30 × 15 =
20. 20.36 × 24 =
21. 21.12 × 15 =
22. 22.17 × 14 =
23. 23.28 × 18 =
24. 24.19 × 12 =
25. 25.28 × 14 =
26. 26.44 × 18 =
27. 27.21 × 16 =
28. 28.21 × 18 =
29. 29.36 × 16 =
30. 30.22 × 12 =
31. 31.41 × 16 =
32. 32.37 × 12 =
33. 33.30 × 14 =
34. 34.15 × 15 =
35. 35.18 × 15 =
36. 36.15 × 12 =
37. 37.21 × 24 =
38. 38.31 × 14 =
39. 39.14 × 16 =
40. 40.12 × 16 =

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