Writing Expressions
"I am an algebraic expression that represents '5 more than a number x.' What am I"
x + 5
If x = 7, what is the value of 4 + x?
11
Solve for x.
x + 9 = 15
x = 6
Andrea has some apples. She buys 4 more, and now she has 12 apples. How many apples did she have at first?
8 apples
"I am an algebraic expression that means 'twice a number y decreased by 3.' What am I?"
2y−3
If y = 6, what is the value of 2y - 3 =?
9
3y = 21
y = 7
A box weighs 5 kg, and another box is twice as heavy. What is the weight of the second box?
10 kg
"I describe 'three times a number n minus 5.' What is my algebraic form?"
3n−5
If x = 4, evaluate 2x + 5
13
Solve for y.
4y + 3 = 19
y = 4
Amy has three times as many marbles as Ben. If Ben has 5 marbles, how many does Amy have?
15 marbles
A school ordered 6 times as many red markers as blue markers. If there were 18 blue markers, how many red markers were ordered?
6×18
=108
"If you take a number x, divide it by 2, and then add 7, what is the algebraic expression?"
x / 2 + 7
If y = 6, evaluate 2 - 10 / 2
7
A ribbon is 24 cm long. It is cut into equal pieces, each measuring x cm. If there are 6 pieces, write an equation and solve for x
x = 4 cm
Write an algebraic expression for 'four times a number n minus the sum of that number and 6.
4n - (n + 6)
A pizza costs $12. The price of a burger is half the price of the pizza. If you buy 2 burgers and a pizza, how much do you spend in total?
Total cost is $24.
If x=3 = and y=4, evaluate 5x−2y + 7
5(3)−2(4)+7
=15−8+7
=14