ARITHMETICS

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Last updated 3:01 PM on 9/15/26
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5 Terms

1
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800 pesos with a 25% discount, what is the price?

100 - 25 = 75 → 800(0.75) = 600

2
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Average is 82, what to add to make the average 85?

85 × 5 = 425
82 × 4 = 328
425 - 328 = 97

3
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Percentage change

(new−old)old⋅100%\frac{\left(new-old\right)}{old}\cdot100\%

4
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Direct proportion

x1y1=x2y2\frac{x1}{y1}=\frac{x2}{y2}

5
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Inverse proportion

x1*y1 = x2*y2