Rewrite division as fraction: Rewrite the division as a simple fraction. So, 4÷20 can be written as 204.
Simplify fraction: Simplify the fraction by dividing both the numerator and the denominator by their greatest common divisor, which is 4. So, (4÷4)/(20÷4) equals 1/5.
Convert fraction to decimal: Convert the fraction 51 into decimal form. To do this, we can perform the division 1÷5.
Perform division: Perform the division. Since 1 is less than 5, we add a decimal point and a zero to the right of 1, making it 10. Now, we divide 10 by 5, which equals 2.
Write final answer in decimal form: Write the final answer in decimal form. So, 51 as a decimal is 0.2.
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