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Math Tutor Solution: 21/1 as a decimal is 21
Methods
Method 1 from a Math Tutor– Explanation using the division method:
A fraction is written in terms of two parts: the number on top is called the numerator and the number on the bottom is called the denominator. We can use the division method to solve this question. To get a decimal, simply divide the numerator 21 by the denominator 1:
21 (numerator) ÷ 1 (denominator) = 21
As a result, you get 21 as your answer when you convert 21/1 to a decimal.
Method 2 from a Math Tutor – Explanation using the factors of 10 method:
Sometimes, dividing a number by a power of 10 (like 10, 100, 1000 etc.) is easy because all you need to do is move the invisible decimal place left by how many zeros you have in the power of 10. But for this question, the denominator, 1, isn’t a power of 10.
However, we can change the fraction: if the denominator is a factor of a power of 10, like 2, 4, 5, 8, 10, 16, 20, 25, 40, 50 and so on, then we can convert the fraction into one that is easy to calculate.
To do this, we need to make the denominator to a power of 10 - to make 1 a power of 10, we need to multiply by 10 (1 * 10 = 10). We multiplied the denominator by 10, so now we need to also multiply the numerator by 10 too:
Math Tutor Suggets: Practice more conversion problems
All it takes to be better at something is some practice! Our math tutors suggest that you take a look at some more similar problems on converting fractions to decimals and give them a go:
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