Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 358 · 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. 1.32 × 12 =
2. 2.33 × 12 =
3. 3.26 × 24 =
4. 4.25 × 16 =
5. 5.15 × 18 =
6. 6.18 × 24 =
7. 7.46 × 18 =
8. 8.36 × 15 =
9. 9.48 × 12 =
10. 10.31 × 16 =
11. 11.41 × 18 =
12. 12.40 × 14 =
13. 13.38 × 12 =
14. 14.27 × 24 =
15. 15.45 × 14 =
16. 16.40 × 24 =
17. 17.27 × 14 =
18. 18.49 × 18 =
19. 19.30 × 14 =
20. 20.42 × 14 =
21. 21.35 × 24 =
22. 22.49 × 24 =
23. 23.44 × 15 =
24. 24.46 × 12 =
25. 25.15 × 12 =
26. 26.36 × 18 =
27. 27.47 × 24 =
28. 28.30 × 15 =
29. 29.23 × 14 =
30. 30.19 × 15 =
31. 31.43 × 16 =
32. 32.34 × 15 =
33. 33.16 × 14 =
34. 34.17 × 18 =
35. 35.35 × 18 =
36. 36.16 × 24 =
37. 37.21 × 18 =
38. 38.43 × 14 =
39. 39.36 × 16 =
40. 40.29 × 16 =

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