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Name:______________________
Writing Expressions
8
th
Date:_________
Grade Mathematics
Directions: Write each of the following as an algebraic expression.
1. Half of the sum of a number and eight
2. One third of a number and ten
3. Fifteen less than twice a number
4. Triple the number of a number and seven
5. Twenty less than one fourth a number
Directions: Write each of the following as an algebraic equation and then solve.
6. Seventy eight is ten less than half a number
7. Three times a number increased by twelve is thirty-nine
8. Twice the sum of a number and six is forty-four
9. Five less than six times a number is one hundred twenty-one
10. Half of the sum of a number a thirty is twenty-seven
Directions: Write and solve an equation for each of the following word problems.
11. According to the Food and Drug Administration, the recommended daily intake of iron is
18 mg. This is 4 less than twice the recommended daily intake of zinc. What is the
recommended daily intake of zinc?
12. Suppose you adopt a puppy from an animal shelter and buy three bags of dog food. The
adoption fee is $125 and you spend a total of $154.97. How much does each bag of dog
food cost?
13. Suppose you buy a slice of pizza for $1.50. You also split the cost of renting a video
with two friends. Your total cost is $2.75. What is the cost of renting a video?