Flashcards: Mastering Ratios, Proportions, and Percent Applications — 20 cards

Ratios — definition?

Comparison of two quantities as a quotient.

Proportion — role?

States two ratios are equivalent.

Cross-multiplication — function?

Solves proportions by multiplying across.

Unit rate — example?

Speed or cost per item.

Fraction to decimal — process?

Divide numerator by denominator.

Decimal to percent — conversion?

Move decimal two places right.

Percent to decimal — conversion?

Divide percent by 100.

Percent equation — setup?

e.g., 0.30×x=60.

Percent proportion — format?

Part/Whole = Percent/100.

Percent increase — formula?

(New - Original)/Original × 100.

Sales tax — calculation?

Original price × tax rate.

Simple interest — formula?

I = P × R × T.

Square root — meaning?

Number that squares to original.

Pythagoras — theorem?

c² = a² + b² in right triangles.

Polygon perimeter — calculation?

Sum of all sides.

Circumference — circle?

2πr, boundary length of circle.

Circle area — formula?

π × radius².

Triangle area — formula?

(1/2) × base × height.

Rectangle area — calculation?

length × width.

Circle radius — relation?

Distance from center to perimeter.