Area of a triangle – Geometry
Area of a triangle To figure out the area of a triangle, multiply the base by the height of the triangle, and then divide by two: (Base x Height)/2. That's because the height [...]
28
07, 2017
28
07, 2017
Area of an oval – Geometry
Area of an oval The area of an oval is the part of a plane that is inside its circumference. To figure out the area, you need to measure the height and width of the oval. [...]
28
07, 2017
Area of a circle – Geometry
The geometry of a circle The area of a circle is the flat surface inside its circumference. The area is always equal to the radius squared, multiplied by π (pi). Here's a proof that [...]
27
07, 2017
What’s an angle? Geometry made simple
Two lines cross and form four angles Where any two lines cross each other, they form four angles. These angles are parts of a circle (as you can see from the green circle segments), [...]
27
07, 2017
What is algebra? Math made simple
Simple equations on a graph Algebra is the way Islamic mathematicians figured out to connect our ideas about geometry with our ideas about numbers. You can use equations to represent geometric shapes. You can [...]
27
07, 2017
Simple equations – Algebra
Simple equations on a graph Start by thinking of a number line When we learn to add and subtract, multiply and divide, we think of numbers as being all along the number line. But in algebra we think about numbers as [...]
27
07, 2017
Number plane project – Battleship
A game of Battleship A fun way to practice plotting points on the number plane is to play Battleship. You will need two pieces of graph paper, two pencils, and two kids. Each kid [...]
27
07, 2017
Medieval Islamic mathematics
Indian numbers and medieval Islamic mathematics Indian numbers About 630 AD, just before the Islamic empire got started, people in West Asia learned from traders or traveling scholars about "Arabic" numbers. Indian mathematics The invention [...]
19
06, 2017
Numbers in ancient Egypt
How to write 103,367 in Egyptian numbers How to write Egyptian numbers By about 3000 BC, the ancient Egyptians had ways to write down numbers. They made one vertical line [...]
12
06, 2017
What’s a percentage?
A sheep in a pasture A percentage is a certain number of hundredths of something. For instance, if you have a hundred sheep, and you give five of them to [...]
