Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 773 · 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. 1.36 × 15 =
2. 2.17 × 16 =
3. 3.38 × 12 =
4. 4.16 × 14 =
5. 5.31 × 15 =
6. 6.11 × 24 =
7. 7.34 × 14 =
8. 8.23 × 12 =
9. 9.19 × 14 =
10. 10.25 × 24 =
11. 11.44 × 15 =
12. 12.17 × 14 =
13. 13.46 × 15 =
14. 14.21 × 16 =
15. 15.33 × 14 =
16. 16.22 × 15 =
17. 17.35 × 16 =
18. 18.11 × 12 =
19. 19.44 × 24 =
20. 20.21 × 18 =
21. 21.18 × 16 =
22. 22.32 × 15 =
23. 23.21 × 12 =
24. 24.24 × 16 =
25. 25.31 × 12 =
26. 26.38 × 14 =
27. 27.46 × 16 =
28. 28.17 × 18 =
29. 29.27 × 14 =
30. 30.33 × 12 =
31. 31.33 × 15 =
32. 32.19 × 12 =
33. 33.37 × 24 =
34. 34.13 × 24 =
35. 35.30 × 18 =
36. 36.49 × 15 =
37. 37.36 × 16 =
38. 38.13 × 15 =
39. 39.37 × 16 =
40. 40.40 × 16 =

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