Multiplying the common ordinary fractions: - 30/57 × - 27/28 = ? The multiplication process explained. The result written: As a positive proper fraction (the numerator < the denominator). As a decimal number. As a percentage
- 30/57 × - 27/28 = ?
Simplify the operation
Rewrite the equivalent simplified operation:
Combine the signs of the fractions into a single one, placed in front of the expression. If the sign is + then it is usually not written.
The sign of a multiplication operation:
+ 1 × + 1 = + 1
+ 1 × - 1 = - 1
- 1 × - 1 = + 1
- 30/57 × - 27/28 =
30/57 × 27/28
Simplify the operation
Reduce (simplify) the fractions to their lowest terms equivalents:
To fully reduce a fraction, to the lowest terms equivalent: divide the numerator and denominator by their greatest common factor, GCF.
* By reducing the values of the numerators and the denominators of the fractions the calculations are easier to make.
A fully reduced (simplified) fraction is one with the smallest possible numerator and denominator, one that can no longer be reduced, and it is called an irreducible fraction.
* In order to easily reduce a fraction, factor its numerator and denominator. This way all the common prime factors are easily identified and crossed out, without calculating the GCF.
30/57 =
(2 × 3 × 5)/(3 × 19) =
((2 × 3 × 5) ÷ 3)/((3 × 19) ÷ 3) =
(2 × 3 ÷ 3 × 5)/(3 ÷ 3 × 19) =
(2 × 1 × 5)/(1 × 19) =
10/19
27/28 is already reduced to the lowest terms.
The numerator and denominator have no common prime factors.
Their prime factorization:
27 = 33
28 = 22 × 7
Rewrite the equivalent simplified operation:
30/57 × 27/28 =
10/19 × 27/28
Perform the operation of calculating the fractions
Multiply the fractions:
1) Multiply the numerators, that is, all the numbers above the fractions bars, separately.
2) Multiply the denominators, that is, all the numbers below the fractions bars, separately.
* Factor all the numerators and all the denominators in order to easily reduce (simplify) the end fraction.
10/19 × 27/28 =
(10 × 27) / (19 × 28) =
(2 × 5 × 33) / (19 × 22 × 7) =
(2 × 33 × 5) / (22 × 7 × 19)
Fully reduce (simplify) the end fraction to its lowest terms equivalent:
Calculate the greatest common factor, GCF,
of the numerator and denominator of the fraction:
A fully reduced (simplified) fraction is one with the smallest possible numerator and denominator, one that can no longer be reduced, and it is called an irreducible fraction.
To fully reduce a fraction, to the lowest terms equivalent: divide the numerator and denominator by their greatest common factor, GCF.
* To calculate the GCF, we need to factor the numerator and the denominator of the fraction into prime factors.
Then multiply all the common prime factors: if there are repeating prime factors we only take them once, and only the ones having the lowest exponent (the lowest powers).
GCF (2 × 33 × 5; 22 × 7 × 19) = 2
Divide the numerator and the denominator by their GCF:
(2 × 33 × 5) / (22 × 7 × 19) =
((2 × 33 × 5) ÷ 2) / ((22 × 7 × 19) ÷ 2) =
(2 ÷ 2 × 33 × 5)/(22 ÷ 2 × 7 × 19) =
(1 × 33 × 5)/(2(2 - 1) × 7 × 19) =
(1 × 33 × 5)/(21 × 7 × 19) =
(1 × 33 × 5)/(2 × 7 × 19) =
(33 × 5)/(2 × 7 × 19) =
(27 × 5)/(2 × 7 × 19) =
135/266
Rewrite the fraction
As a decimal number:
Simply divide the numerator by the denominator, without a remainder, as shown below:
135/266 =
135 ÷ 266 ≈
0.507518796992 ≈
0.51
As a percentage:
A percentage value p% is equal to the fraction: p/100, for any decimal number p. So, we need to change the form of the number calculated above, to show a denominator of 100.
To do that, multiply the number by the fraction 100/100.
The value of the fraction 100/100 = 1, so by multiplying the number by this fraction the result is not changing, only the form.
0.507518796992 =
0.507518796992 × 100/100 =
(0.507518796992 × 100)/100 =
50.751879699248/100 ≈
50.751879699248% ≈
50.75%
The final answer:
written in three ways
As a positive proper fraction:
(the numerator < the denominator)
- 30/57 × - 27/28 = 135/266
As a decimal number:
- 30/57 × - 27/28 ≈ 0.51
As a percentage:
- 30/57 × - 27/28 ≈ 50.75%
How are the numbers being written on our website: comma ',' is used as a thousands separator; point '.' used as a decimal separator; numbers rounded off to max. 12 decimals (if the case). The set of the used symbols on our website: '/' the fraction bar; ÷ dividing; × multiplying; + plus (adding); - minus (subtracting); = equal; ≈ approximately equal.
Other similar operations
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