Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 900 · 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. 1.49 × 16 =
2. 2.28 × 15 =
3. 3.43 × 18 =
4. 4.14 × 12 =
5. 5.47 × 14 =
6. 6.29 × 14 =
7. 7.29 × 15 =
8. 8.13 × 15 =
9. 9.18 × 14 =
10. 10.29 × 24 =
11. 11.24 × 15 =
12. 12.32 × 14 =
13. 13.14 × 16 =
14. 14.25 × 18 =
15. 15.46 × 18 =
16. 16.21 × 24 =
17. 17.29 × 18 =
18. 18.32 × 15 =
19. 19.35 × 24 =
20. 20.27 × 14 =
21. 21.34 × 15 =
22. 22.40 × 18 =
23. 23.12 × 15 =
24. 24.26 × 12 =
25. 25.20 × 18 =
26. 26.14 × 18 =
27. 27.43 × 15 =
28. 28.40 × 16 =
29. 29.26 × 14 =
30. 30.29 × 16 =
31. 31.11 × 18 =
32. 32.23 × 24 =
33. 33.47 × 15 =
34. 34.13 × 24 =
35. 35.12 × 12 =
36. 36.45 × 14 =
37. 37.47 × 16 =
38. 38.38 × 16 =
39. 39.20 × 16 =
40. 40.30 × 15 =

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