Convert 4.05 to a ratio (decimal 4.05 as a ratio)

4.05 as a ratio

Here we will show you how to convert the decimal number 4.05 to a ratio. In other words, we are going to convert the decimal number 4.05 to the a:b ratio format. The steps to converting the decimal number 4.05 to a ratio are as follows:

Step 1) Convert the decimal number to a fraction by making 4.05 the numerator and 1 the denominator, like this:

4.05 =

		4.05
		1

Step 2) Multiply the numerator and denominator by 100 to eliminate the decimal point.

		4.05 × 100
		1 × 100

		405
		100

Step 3) Simplify the fraction in the previous step by dividing the numerator and the denominator by the greatest common factor (GCF) of 405 and 100. (The GCF of 405 and 100 is 5.)

		405 ÷ 5
		100 ÷ 5

		81
		20

Step 4) Convert the fraction in the previous step to a ratio by replacing the divider line with a colon like this:

		81
		20

= 81:20

That's all there is to it. Now you know 4.05 as a ratio. Once again, below is the answer to the decimal number 4.05 converted to a ratio:

81:20

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