Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 923 · 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. 1.48 × 16 =
2. 2.15 × 18 =
3. 3.48 × 12 =
4. 4.39 × 15 =
5. 5.26 × 24 =
6. 6.21 × 24 =
7. 7.33 × 14 =
8. 8.20 × 18 =
9. 9.23 × 18 =
10. 10.47 × 15 =
11. 11.11 × 18 =
12. 12.35 × 16 =
13. 13.45 × 14 =
14. 14.46 × 24 =
15. 15.24 × 24 =
16. 16.32 × 18 =
17. 17.30 × 24 =
18. 18.44 × 12 =
19. 19.34 × 15 =
20. 20.12 × 15 =
21. 21.44 × 16 =
22. 22.29 × 12 =
23. 23.18 × 16 =
24. 24.31 × 12 =
25. 25.37 × 16 =
26. 26.32 × 24 =
27. 27.21 × 15 =
28. 28.46 × 12 =
29. 29.42 × 16 =
30. 30.42 × 14 =
31. 31.33 × 12 =
32. 32.30 × 14 =
33. 33.16 × 18 =
34. 34.43 × 24 =
35. 35.41 × 24 =
36. 36.21 × 16 =
37. 37.21 × 12 =
38. 38.38 × 16 =
39. 39.42 × 24 =
40. 40.35 × 15 =

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