﻿ Substracting fractions: - on line calculation, formula - FORMIAX ﻿

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# Substracting fractions

a, c, e = numerator

b, d, f = denominator

-- = fraction line

## WHAT IS IT ?

Fraction is numerical quantity that is not a whole number.
• the top number (the numerator) says how many parts we have.
• the bottom number (the denominator) says how many parts the whole is divided into

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## CALCULATION:

Enter numerator 1

Enter denominator 1

Enter numerator 2

Enter denominator 2

## EXAMPLE:

numeratorA is 1

denominatorA is 2

numeratorB is 2

denominatorB is 5

1   2   1
---- - ---- = -----
2   5   10

When subtracting fractions, we first need to find the least common denominator of denominators A and B, which in our case is 10 (10 is divisible by both 2 and 5).

numeratorA is then multiplied by the number of times denominatorA (2) fits into the common denominator (10).

10/2 = 5

numeratorA is then 1 * 5 = 5

We do the same for numeratorB

10/5 = 2

numeratorB is then

2 * 2 = 4

The common numerator is then 5 - 4 = 1

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