Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 632 · 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 × 16 =
2. 2.23 × 24 =
3. 3.14 × 24 =
4. 4.43 × 12 =
5. 5.39 × 15 =
6. 6.16 × 14 =
7. 7.15 × 12 =
8. 8.29 × 12 =
9. 9.48 × 24 =
10. 10.34 × 18 =
11. 11.36 × 14 =
12. 12.40 × 18 =
13. 13.20 × 24 =
14. 14.45 × 16 =
15. 15.44 × 18 =
16. 16.12 × 16 =
17. 17.31 × 15 =
18. 18.34 × 14 =
19. 19.47 × 14 =
20. 20.26 × 24 =
21. 21.38 × 12 =
22. 22.49 × 15 =
23. 23.45 × 24 =
24. 24.40 × 16 =
25. 25.32 × 12 =
26. 26.37 × 15 =
27. 27.40 × 24 =
28. 28.33 × 12 =
29. 29.14 × 16 =
30. 30.30 × 14 =
31. 31.27 × 16 =
32. 32.37 × 12 =
33. 33.31 × 18 =
34. 34.41 × 24 =
35. 35.30 × 16 =
36. 36.41 × 16 =
37. 37.26 × 18 =
38. 38.37 × 14 =
39. 39.32 × 14 =
40. 40.18 × 24 =

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