Writing Equations
A number plus twenty five equals twenty seven.
n + 25 = 27
98=19.6x
x=5
Inverse operations ________ each other.
Undo or cancel.
Three friends went to lunch and the bill was $25. Write an equation to represent the cost for each friend.
3x=25
Fifty five is the product of a number and 11.
55 = n (11)
3x-8=49
x=19
What's the first step in solving this problem? (after drawing the line down the middle). 3.9x=45
Dividing both sides by 3.9
Six friends share a box of pencils. Each person receives two pencils. Write and solve an equation to find the number of pencils in the box.
x/6 = 212 pencils.
45 less than a number is 80.
n-45=80
28 = n/12
n=336
What's the first step in solving this problem? (after drawing the line down the middle).
x+6.7=9.5
Subtract 6.7 from both sides.
Write an equation to represent the situation:
A car traveled m miles over 13 days. Write an equation to find the total miles it traveled 90 miles each day.
m/13=90
One third of a number is four fifths.
1/3x=4/5
or x/3=4/5
Eighty eight is the product of 5 and a number.
x=17.6
What's the first step in solving this problem? (after drawing the line down the middle).
6.7=x/5.5
Multiplying both sides by 5.5
Write and solve the equation
You go to the store with some money. You spend it on a $12.50 shirt and a $4.50 hat. If you left with $3.25, how much did you have when you got to the store?
m-12.50-4.50=3.25
m=20.25
One-fourth less than two ninths of a number is 6.
2/9x-1/4=6
Seven less than 1/5 of a number is 11.
x=90
EXPLAIN all the step to solving this equation (after drawing the line).
67=x/7+2/3
1. subtract 2/3 to each side
2. multiply each side by 7
3. check you answer
Write and solve an equation:
Each household in a neighborhood contributes $25 to a neighborhood block party. The total amount raised is $675. Write and solve an equation to show how many houses are in the neighborhood.
25x=675
x=27