Shape names

In the past couple of days we've been talking a lot about shapes. So today I thought it would be good to talk about shapes and where their names come from.
3 sides - Triangle - Tri = 3
4 sides - qudrilateral - quad - 4 sides
5 sindes - Pentagon - penta = 5
6 sides - Hexagon - Hex = 6
7 sides - Heptagon
8 sides - Octagon
9 sides - nonagon
10 sides - decagon
Many times after 10 sides the shape will be refered to as an "n" gon where n is the number of sides.
Knowing the names of these shapes is important when identifying other shapes such as cubes, pentagonal prisms or a octagonal pyramid.

Just for reference here is a picture on the shape names.

Lattice Method

I was just working on some multiplication problems I had to do for my class. A couple of my classmates didnt know the easiest way to multiply large numbers. There are multiple ways that I've learned throughout my education but the easiest and my personal favorite is the lattice method. The lattice method makes multipling big numbers extremely easy by only having to do multiplication with numbers 0-9. It uses multiplication of small numbers and simple addition to get your final answer.

Here's what the Lattice Method looks like. You put the numbers you are multiplying in the top and right sides of the box in this example we're multiplying 948 and 827

8*9 = 72

2*9 = 18

7*3 = 63

After you are finished multiplying these numbers add them together throughout the rest of the lines carrying numbers as needed. If you want more information visit this website that more throughly explains how to use the lattice method.

Shape Areas

Today I thought it would be a good idea to discuss how my mind works when I'm finding the area of various shapes. With any shape there is always another shape inside of it. A square is easy to find the area of you just multiply the length and the width. Exact same equation with a parrallelogram. A triangle is the exact same you just divide by 2. But what about with a trapezoid or a hexagon? is there a formula that we can use to make sense of these areas? or can we wing it in another way to find the area by manipulating the shape itself.

The answer is yes. You can manipulate any shape into multiple different shapes that you do know the equation for. For example break a hexagon into 6 triangles or 2 trapezoids. This website provides a small window into the world of shape areas and I encourage you to take a closer look to see what you can learn. As you scroll closer to the bottom it will start to explain some of the things I am talking about

Decimals

Decimals are another thing we have been talking about in class lately. Decimals can be very hard to understand at times but it helps us be precise. Decimals are all about place value every place you move to the left the place value is ten times as much as the previous value. Just as every place value you move to the right the place value is 10 times less. This Website has a place value editor to show what I'm talking about. It also has some other quick facts that are worth some time to take a quick look at. Play with it and practice. It's key to understanding how we use decimals.