Maths

adding (+)

This is the very beginning of understanding how addition works. Let's look at two sets:

Set A Set B

Count how many triangles are in Set A...

There are 2!

Count how many triangles are in Set B...

There are 3!

Count how many triangles are in this set...There are 5!

Now, put the sets together into one big set:

                                                                                                                      

Set A Set B

Count how many circles are in Set A...

There are 4!

Count how many circles are in Set B...

There are 5!

Here's another one:

                                                                                          

                                                                                                       

Count how many circles are in this set...There are 9!

Now, put the sets together into one big set:

                                                                                                                                                

                                                        

                                                                                                                     

Subtraction (-)

This is the very beginning of understanding how subtraction works.

Let's look at this set:

Count how many trianglesare in this set...  There are 5!

Count how many triangles are left

in the set... There are 3 left!

         Now, take two triangles away...

Here's another one:Look at this set:

Count how many circlesare in this set...  There are 9!

Count how many circles are left

in the set... There are 4 left!

Now, take five circles away...

        

Let's see what's really going on when we multiply two numbers.

This means that you have two groups of 3!

Put the two groups together...  How many triangles do you have?

Count them...  One, two, three, four, five, six!So, our answer is: