Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 888 · 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. 1.35 × 18 =
2. 2.20 × 14 =
3. 3.29 × 12 =
4. 4.41 × 14 =
5. 5.38 × 16 =
6. 6.27 × 24 =
7. 7.17 × 18 =
8. 8.44 × 15 =
9. 9.29 × 14 =
10. 10.38 × 12 =
11. 11.40 × 15 =
12. 12.27 × 12 =
13. 13.40 × 24 =
14. 14.37 × 15 =
15. 15.44 × 16 =
16. 16.21 × 14 =
17. 17.46 × 16 =
18. 18.17 × 14 =
19. 19.12 × 24 =
20. 20.45 × 14 =
21. 21.28 × 24 =
22. 22.19 × 14 =
23. 23.13 × 12 =
24. 24.32 × 16 =
25. 25.21 × 18 =
26. 26.41 × 24 =
27. 27.12 × 15 =
28. 28.23 × 15 =
29. 29.29 × 15 =
30. 30.17 × 16 =
31. 31.42 × 18 =
32. 32.19 × 12 =
33. 33.42 × 16 =
34. 34.46 × 12 =
35. 35.11 × 16 =
36. 36.43 × 24 =
37. 37.18 × 12 =
38. 38.14 × 24 =
39. 39.48 × 18 =
40. 40.29 × 16 =

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