Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 998 · 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. 1.11 × 24 =
2. 2.29 × 14 =
3. 3.15 × 15 =
4. 4.32 × 12 =
5. 5.46 × 24 =
6. 6.14 × 12 =
7. 7.38 × 15 =
8. 8.21 × 18 =
9. 9.24 × 24 =
10. 10.12 × 12 =
11. 11.47 × 16 =
12. 12.17 × 16 =
13. 13.30 × 12 =
14. 14.47 × 15 =
15. 15.36 × 14 =
16. 16.21 × 12 =
17. 17.14 × 15 =
18. 18.19 × 24 =
19. 19.42 × 18 =
20. 20.11 × 14 =
21. 21.46 × 15 =
22. 22.35 × 15 =
23. 23.36 × 16 =
24. 24.29 × 18 =
25. 25.18 × 15 =
26. 26.25 × 16 =
27. 27.21 × 16 =
28. 28.48 × 16 =
29. 29.22 × 14 =
30. 30.23 × 18 =
31. 31.34 × 16 =
32. 32.47 × 24 =
33. 33.20 × 24 =
34. 34.37 × 15 =
35. 35.38 × 12 =
36. 36.27 × 12 =
37. 37.44 × 12 =
38. 38.31 × 24 =
39. 39.21 × 24 =
40. 40.43 × 16 =

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