It appears that you mean 1,500,420. You would write it as one million five hundred thousand four hundred twenty.
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420 = (4 x 100) + (2 x 10) + (0 x 1)
To write the fraction 4 and 1/5 as a percentage, we need to convert it to a decimal first. 1/5 as a decimal is 0.2. Then, add it to the whole number 4 to get 4.2. Finally, multiply 4.2 by 100 to get the percentage, which is 420%.
Roman ' D ' = 500.For a number over 500, write ' D ', then follow it with the amount over 500.For example:To write 511, (recalling that ' X ' = 10, and ' I ' = 1),D X I
500/10000 = 1/20 in its simplest form
420 million can be written as 420,000,000 in digits.