Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 943 · 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. 1.29 × 15 =
2. 2.15 × 12 =
3. 3.33 × 12 =
4. 4.32 × 18 =
5. 5.43 × 14 =
6. 6.32 × 16 =
7. 7.35 × 12 =
8. 8.27 × 14 =
9. 9.15 × 18 =
10. 10.48 × 12 =
11. 11.35 × 24 =
12. 12.40 × 14 =
13. 13.24 × 16 =
14. 14.42 × 16 =
15. 15.20 × 16 =
16. 16.44 × 12 =
17. 17.23 × 15 =
18. 18.49 × 14 =
19. 19.15 × 15 =
20. 20.18 × 18 =
21. 21.36 × 14 =
22. 22.29 × 16 =
23. 23.47 × 24 =
24. 24.41 × 14 =
25. 25.33 × 16 =
26. 26.30 × 18 =
27. 27.40 × 18 =
28. 28.21 × 12 =
29. 29.28 × 15 =
30. 30.29 × 14 =
31. 31.17 × 18 =
32. 32.25 × 24 =
33. 33.12 × 24 =
34. 34.47 × 18 =
35. 35.32 × 15 =
36. 36.26 × 18 =
37. 37.26 × 12 =
38. 38.16 × 14 =
39. 39.29 × 18 =
40. 40.16 × 16 =

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