What are variables in algebra?

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Unknowns in addition or subtraction equations
Draw the missing circles in the unknown box. Write the missing number in the equation.
Unknowns in multiplication or division equations
Finish drawing the circles to solve the equation. Trace around the circles to make equal groups.
Writing equations with variables for addition or subtraction
Write the equation with variables for the phrase:
1. 10 more than $h$ equals 64
2. 73 increased by $x$ equals 109
3. $b$ less than 8 equals 2
4. 24 decreased by $s$ equals 17
Writing equations with variables for multiplication or division
Write the equation with variables for the phrase:
1. the product of 4 and 6 equals $a$
2. 9 times $j$ equals 72
3. the quotient of 24 and 3 equals $c$
4. $k$ divided by 10 equals 5
Equations with variables: word problems
Write the equation for the word problem. Use the variable $x$ $x$ for the unknown value.
1. Allie picked 9 strawberries and Troye picked 8 strawberries. How many strawberries did they pick in total?
2. Brian got 24 on the quiz. Ellie got 2 points less than Brian. How many points did Ellie get on her quiz?
3. For which case should you use multiplication or division?
  1. There are 5 red apples. There are 2 times as many green apples as red apples. How many green apples are there?
  2. There are 8 red apples. There are 2 times as many red apples as green apples. How many green apples are there?