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Pre-Algebra
Mean
Mode
Greatest Common Factor
Least Common Multiple
Order of Operations
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Mixed Fractions
Prime Factorization
Exponents
Radicals
Algebra
Combine Like Terms
Solve for a Variable
Factor
Expand
Evaluate Fractions
Linear Equations
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Inequalities
Systems of Equations
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Trigonometry
Simplify
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Evaluate
-\frac{20}{21}\approx -0.952380952
View solution steps
Solution Steps
\frac{ 4 }{ 12 } - \frac{ 9 }{ 7 }
Reduce the fraction \frac{4}{12} to lowest terms by extracting and canceling out 4.
\frac{1}{3}-\frac{9}{7}
Least common multiple of 3 and 7 is 21. Convert \frac{1}{3} and \frac{9}{7} to fractions with denominator 21.
\frac{7}{21}-\frac{27}{21}
Since \frac{7}{21} and \frac{27}{21} have the same denominator, subtract them by subtracting their numerators.
\frac{7-27}{21}
Subtract 27 from 7 to get -20.
-\frac{20}{21}
Factor
\frac{{(-1)} \cdot 2 ^ {2} \cdot 5}{3 \cdot 7} \approx -0.952380952
Quiz
Arithmetic
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\frac{ 4 }{ 12 } - \frac{ 9 }{ 7 }
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How do you evaluate the expression \displaystyle{12}-\frac{{9}}{{3}}-{2} ?
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\frac{1}{3}-\frac{9}{7}
Reduce the fraction \frac{4}{12} to lowest terms by extracting and canceling out 4.
\frac{7}{21}-\frac{27}{21}
Least common multiple of 3 and 7 is 21. Convert \frac{1}{3} and \frac{9}{7} to fractions with denominator 21.
\frac{7-27}{21}
Since \frac{7}{21} and \frac{27}{21} have the same denominator, subtract them by subtracting their numerators.
-\frac{20}{21}
Subtract 27 from 7 to get -20.
Similar Problems
\frac{ 4 }{ 12 } - \frac{ 9 }{ 7 }
\frac{ 4 }{ 12 } \times \frac{ 9 }{ 8 }
\frac{ 4 }{ 12 } \div \frac{ 9 }{ 8 }
\frac{ 4 }{ 12 } + \frac{ 9 }{ 8 }
\frac{ 4 }{ 12 } + \frac{ 9 }{ 8 } \times \frac{15}{3} - \frac{26}{10}
\frac{ 1 }{ 8 } + 2 ( \frac{ 9 }{ 7 } ) \div \frac{15}{3}
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