# What is multiplication used for?

## Multiply - basic arithmetic in mathematics

### Examples

Let's look at this Whole practically once.

If we want to do the math:

\$ 5 \; + \; 5 \; + \; 5 \; + \; 5 \; + \; 5 \; + \; 5 \; + \; 5 \; \$ we get \$ 35 \$.

So we add \$ 7 times the \$ 5 together. That's exactly what it is approach for the multiplication.

\$ 7 \; \ cdot \; 5 \; = \; \$ 35

So we see that the multiplication a short form the addition is. You could also write out the \$ 5 and add it to yourself to get that solution receive.

Let's take a look further examples at:

\$ 3 \; \ cdot \; 4 \; = \; \$ 12

\$ 6 \; \ cdot \; 5 \; = \; \$ 30

\$ 2 \; \ cdot \; 12 \; = \; \$ 24

\$ 9 \; \ cdot \; 8th \; = \; \$ 72

\$ 1 \; \ cdot \; 3 \; = \; \$ 3

### Multiply in writing

If you have large numbers and need to multiply them together, you can use written multiplication. We have used these in the following figure. written multiplication of \$ 23 \$ and \$ 36 \$

In the writtenmultiplication so you have to write the numbers that you want to multiply together next to each other. Then you calculate the numbers individually. Here is an example:

\$ \ textcolor {green} {23} \ cdot \ textcolor {blue} {36} \$

So you go step by step and do the math first the \$ \ textcolor {blue} {30} \$ times the \$ \ textcolor {green} {3} \$. You get \$ \ textcolor {brown} {90} \$. Add to this come from steptwo:

\$ \ textcolor {green} {20} \ cdot \ textcolor {blue} {30} \$. The result is \$ \ textcolor {brown} {600} \$. You add these two values ​​and you get \$ \ textcolor {brown} {690} \$.

Step three is \$ \ textcolor {blue} {6} \ cdot \ textcolor {green} {3} \$. The result is \$ \ textcolor {brown} {18} \$.

The nextstep is the multiplication of \$ \ textcolor {blue} {6} \$ by \$ \ textcolor {green} {20} \$. The result is \$ \ textcolor {brown} {120} \$. Now you add the two results \$ \ textcolor {brown} {18} \$ and \$ \ textcolor {brown} {120} \$ and you get \$ \ textcolor {brown} {138} \$.

The last step is the addition of the two values, i.e. \$ \ textcolor {brown} {690} + \ textcolor {brown} {138} \$. We get \$ \ textcolor {brown} {828} \$. We write this number under one line so that we can see what the bill and what the solution is.

You do the same with them further examples in front.