Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 402 · 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. 1.35 × 15 =
2. 2.16 × 16 =
3. 3.20 × 24 =
4. 4.34 × 18 =
5. 5.36 × 18 =
6. 6.28 × 16 =
7. 7.18 × 16 =
8. 8.28 × 12 =
9. 9.40 × 14 =
10. 10.12 × 12 =
11. 11.25 × 14 =
12. 12.42 × 12 =
13. 13.46 × 14 =
14. 14.47 × 14 =
15. 15.48 × 15 =
16. 16.31 × 14 =
17. 17.30 × 18 =
18. 18.37 × 18 =
19. 19.16 × 12 =
20. 20.26 × 12 =
21. 21.49 × 14 =
22. 22.26 × 16 =
23. 23.12 × 14 =
24. 24.22 × 18 =
25. 25.48 × 12 =
26. 26.16 × 15 =
27. 27.37 × 14 =
28. 28.13 × 14 =
29. 29.48 × 24 =
30. 30.35 × 14 =
31. 31.24 × 18 =
32. 32.31 × 16 =
33. 33.20 × 18 =
34. 34.17 × 12 =
35. 35.16 × 14 =
36. 36.37 × 16 =
37. 37.43 × 12 =
38. 38.24 × 15 =
39. 39.32 × 24 =
40. 40.48 × 14 =

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