Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 278 · 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. 1.38 × 15 =
2. 2.19 × 14 =
3. 3.21 × 14 =
4. 4.44 × 24 =
5. 5.35 × 16 =
6. 6.47 × 12 =
7. 7.31 × 24 =
8. 8.42 × 15 =
9. 9.39 × 18 =
10. 10.18 × 24 =
11. 11.23 × 14 =
12. 12.17 × 18 =
13. 13.35 × 14 =
14. 14.17 × 24 =
15. 15.34 × 16 =
16. 16.28 × 14 =
17. 17.45 × 24 =
18. 18.43 × 14 =
19. 19.48 × 12 =
20. 20.11 × 15 =
21. 21.13 × 12 =
22. 22.12 × 14 =
23. 23.38 × 24 =
24. 24.32 × 12 =
25. 25.41 × 12 =
26. 26.45 × 16 =
27. 27.26 × 14 =
28. 28.21 × 24 =
29. 29.19 × 24 =
30. 30.38 × 12 =
31. 31.20 × 12 =
32. 32.33 × 12 =
33. 33.38 × 18 =
34. 34.20 × 24 =
35. 35.45 × 18 =
36. 36.31 × 12 =
37. 37.34 × 18 =
38. 38.15 × 24 =
39. 39.38 × 14 =
40. 40.27 × 18 =

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