First, let’s break down each piece of the problem. We have the fraction, 21/5, which is also the dividend, and the whole number, or the divisor, which is 18:
Numerator of the dividend: 21
Denominator of the dividend: 5
Whole number and divisor: 18
So what is 21/5 Divided by 18? Let’s work through the problem, and find the answer in both fraction and decimal forms.
First let’s set up the problem:
Step 1:
Take the whole number, 18, and multiply it by the denominator of the fraction, 5:
5 x 18 = 90
Step 2:
The result of this multiplication will now become the denominator of the answer. The answer to the problem in fraction form can now be seen:
To display the answer to 21/5 Divided by 18 in decimal form, you can divide the numerator, 90, by the denominator, 21. The answer can be rounded to the nearest three decimal points, if needed:
So, in decimal form, 21 divided by 5/18 = 4.29
And in its simplest fractional form, 21 divided by 5/18 is 30/7
If this problem was a little difficult or you want to practice your skills on another one, give it a go on any one of these too!
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One thing we teach our students at Thinkster is that there are multiple ways to solve a math problem. This helps our students learn to think flexibly and non-linearly.
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