Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 275 · 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. 1.46 × 16 =
2. 2.37 × 15 =
3. 3.49 × 18 =
4. 4.36 × 18 =
5. 5.30 × 16 =
6. 6.35 × 12 =
7. 7.32 × 12 =
8. 8.27 × 16 =
9. 9.15 × 18 =
10. 10.47 × 24 =
11. 11.35 × 14 =
12. 12.46 × 14 =
13. 13.21 × 18 =
14. 14.39 × 16 =
15. 15.22 × 24 =
16. 16.38 × 16 =
17. 17.24 × 16 =
18. 18.28 × 16 =
19. 19.35 × 18 =
20. 20.44 × 12 =
21. 21.25 × 12 =
22. 22.48 × 15 =
23. 23.29 × 12 =
24. 24.19 × 24 =
25. 25.49 × 15 =
26. 26.43 × 16 =
27. 27.29 × 16 =
28. 28.23 × 24 =
29. 29.23 × 12 =
30. 30.23 × 16 =
31. 31.19 × 14 =
32. 32.31 × 14 =
33. 33.41 × 24 =
34. 34.36 × 24 =
35. 35.27 × 14 =
36. 36.36 × 16 =
37. 37.13 × 15 =
38. 38.27 × 12 =
39. 39.24 × 15 =
40. 40.29 × 18 =

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