Well, that's a big number you've got there! When you multiply 20 by 40, you get 800. Then, if you multiply that by 52, you'll get 41,600. Isn't that a happy little number?
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40 of 20 = 40 x 20 = 800 40% of 20 = 0.4 x 20 = 8
40*52 = 2,080. If you need to calculate this in your head, an easy way is to first multiply 52 by 4 instead of 40. That will give you an answer of 208. Then you can multiply by 10 to get 2,080.
1*40 2*20 5*8
20 * 2 = 40
1 x 40 = 40 2 x 20 = 40 4 x 10 = 40 5 x 8 = 40