1. Variables and Expressions

2. Parts of an Expression
Numbers Operations Variables
31 +
0.88 - Any letter:
-254 x or · or () x, y, z, a, m, k
3/4 ÷ or —

3. Parts of an Expression
Numbers Operations Variables
31 +
0.88 - Any letter:
-254 x or · or () x, y, z, a, m, k
3/4 ÷ or —

4. Parts of an Expression
Numbers Operations Variables
31 +
0.88 - Any letter:
-254 x or · or () x, y, z, a, m, k
3/4 ÷ or —

5. Parts of an Expression
Numbers Operations Variables
31 +
0.88 - Any letter:
-254 x or · or () x, y, z, a, m, k
3/4 ÷ or —

6. Key Words
+ – x ÷
add subtract multiply divide
sum difference product quotient
total less

7. Examples

8. Examples
y+9
Nine more than y
9+y
4 less than n n-4
3xz
A number z times 4 3·z
3(z)
12 ÷ a
Twelve divided by a
12/a

9. Examples
y+9
Nine more than y
9+y
4 less than n n-4
3xz
A number z times 4 3·z
3(z)
12 ÷ a
Twelve divided by a
12/a

10. Practice Work
Page 6 numbers 16-25