# What is the time of the pet

Classified in Mathematics

Written at on English with a size of 2.35 KB.

Rates and Ratios

Rates and ratios are the ratios between two or more numbers, divided by a colon. For example

If Daniel, Esther and Fatima share \$400 so that Daniel gets \$200, Esther gets \$150 and Narine gets \$50, then we can write the ratio in which they share the money as:

Daniel : Esther : Fatima = 200 : 150 : 50

Ratios can also be fractions.

Daniel : Esther : Fatima = 200 : 150 : 50

400   400  400

Perimeter

Perimeter is the distance around the circumference of a shape. (pi*d=Circumference)

Surface Area Formulas

2D:

Square = Base x Height

Rectangle = Base x Height

Triangle = (Perpendicular Height x Base) ÷ 2

Trapezium = (Top + Bottom Height) x Perp. Height ÷ 2

Parallelogram = Perpendicular Height x Base

Rhombus = (Length x Height) ÷ 2

Kite = (Length x Height) ÷ 2

3D:

2D Shapes x The amount of time they appear

Fractions:

Add = Make the bottom numbers the same then add the top ones together

Subtract = Make the bottoms numbers the same then subtract the top ones

Multiply = Times Numerator by Numerator and Denominator by Denominator

Divide = Invert and Multiply