Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 929 · 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. 1.40 × 15 =
2. 2.36 × 16 =
3. 3.28 × 12 =
4. 4.47 × 12 =
5. 5.42 × 16 =
6. 6.32 × 14 =
7. 7.38 × 14 =
8. 8.32 × 12 =
9. 9.34 × 12 =
10. 10.11 × 24 =
11. 11.26 × 18 =
12. 12.43 × 14 =
13. 13.23 × 16 =
14. 14.36 × 15 =
15. 15.15 × 24 =
16. 16.37 × 24 =
17. 17.48 × 16 =
18. 18.20 × 14 =
19. 19.41 × 14 =
20. 20.19 × 16 =
21. 21.30 × 16 =
22. 22.20 × 18 =
23. 23.42 × 18 =
24. 24.19 × 15 =
25. 25.20 × 12 =
26. 26.21 × 14 =
27. 27.48 × 24 =
28. 28.14 × 14 =
29. 29.29 × 16 =
30. 30.41 × 18 =
31. 31.21 × 24 =
32. 32.28 × 15 =
33. 33.12 × 14 =
34. 34.38 × 24 =
35. 35.11 × 18 =
36. 36.21 × 18 =
37. 37.14 × 18 =
38. 38.30 × 15 =
39. 39.16 × 18 =
40. 40.41 × 15 =

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