1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410 and 820.
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820,000,000
You can use a calculator to get its decimal value: 28.6356. Or you can simplify it by finding numbers that are factors of 820 that are squares ... 4 x 205 = 820 and so √820 = √4 x √205 = 2√205.
Well, let's take a moment to appreciate the beauty of numbers. To express 820 as a mixed number, we divide 820 by 100 to get 8 whole numbers and 20 left over. So, 820 as a mixed number is 8 20/100, which simplifies to 8 1/5. Just like painting, math can be a delightful adventure when we take our time to understand it.
820
Even. Numbers ending in 0,2,4,6, or 8 are even