Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 164 · 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. 1.37 × 18 =
2. 2.24 × 24 =
3. 3.12 × 15 =
4. 4.45 × 15 =
5. 5.45 × 24 =
6. 6.20 × 18 =
7. 7.15 × 14 =
8. 8.47 × 18 =
9. 9.43 × 18 =
10. 10.40 × 16 =
11. 11.20 × 14 =
12. 12.22 × 18 =
13. 13.17 × 24 =
14. 14.15 × 18 =
15. 15.34 × 15 =
16. 16.17 × 15 =
17. 17.46 × 14 =
18. 18.20 × 24 =
19. 19.15 × 15 =
20. 20.11 × 14 =
21. 21.11 × 15 =
22. 22.25 × 16 =
23. 23.29 × 15 =
24. 24.21 × 24 =
25. 25.34 × 14 =
26. 26.23 × 14 =
27. 27.32 × 12 =
28. 28.18 × 14 =
29. 29.36 × 24 =
30. 30.49 × 14 =
31. 31.30 × 16 =
32. 32.49 × 12 =
33. 33.15 × 12 =
34. 34.20 × 15 =
35. 35.12 × 12 =
36. 36.13 × 18 =
37. 37.29 × 18 =
38. 38.36 × 16 =
39. 39.43 × 14 =
40. 40.20 × 16 =

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