840-840 \times 80 \%
Evaluate
168
Factor
2^{3}\times 3\times 7
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840-840\times \frac{4}{5}
Reduce the fraction \frac{80}{100} to lowest terms by extracting and canceling out 20.
840-\frac{840\times 4}{5}
Express 840\times \frac{4}{5} as a single fraction.
840-\frac{3360}{5}
Multiply 840 and 4 to get 3360.
840-672
Divide 3360 by 5 to get 672.
168
Subtract 672 from 840 to get 168.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}