Evaluate 2/15-1/21

Math
215-121
To write 215 as a fraction with a common denominator, multiply by 77.
215⋅77-121
To write -121 as a fraction with a common denominator, multiply by 55.
215⋅77-121⋅55
Write each expression with a common denominator of 105, by multiplying each by an appropriate factor of 1.
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Multiply 215 and 77.
2⋅715⋅7-121⋅55
Multiply 15 by 7.
2⋅7105-121⋅55
Multiply 121 and 55.
2⋅7105-521⋅5
Multiply 21 by 5.
2⋅7105-5105
2⋅7105-5105
Combine the numerators over the common denominator.
2⋅7-5105
Simplify the numerator.
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Multiply 2 by 7.
14-5105
Subtract 5 from 14.
9105
9105
Cancel the common factor of 9 and 105.
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Factor 3 out of 9.
3(3)105
Cancel the common factors.
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Factor 3 out of 105.
3⋅33⋅35
Cancel the common factor.
3⋅33⋅35
Rewrite the expression.
335
335
335
The result can be shown in multiple forms.
Exact Form:
335
Decimal Form:
0.0857142‾
Evaluate 2/15-1/21

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