A variable is a letter that we replace in math for the number till we know the value of the variable or the number that equals the letter you use. You can only combine a tile when they have the same variable or if they have the same shape.

8+x=
X=1
8+1=9

8x+6x=14x

What does minus means?
Subtraction
Negative numbers
Basic math
Taking away

Below zero

Dash

Symbol
Less
Opposite

In today’s lesson we learned how to subtract tiles. And how we also talked about what minus means. By using tiles and using tiles that were negatives and positive that we added and subtracted. And we learned how to represent an expression in two different ways.

You can represent zero in many ways. One way is by using zero pairs. Another way is balanced sets. And by using both to get zero and canceling all out.

The kind of legal moves that you can use to is zero pairs. You can use this if you have a negative and a positive from the same unit that are in the same mat. You can also use balanced sets like when you have the same kind of units in different Mars or different equation.