Writing Equations

Writing Equations

by Omar Shishani

Poll

Which season do you enjoy the most?

Multiple Choice

Quick Check:

[ plus, sum, more than, increased by ]

All refers to:

• Addition $$+$$  

• Subtraction $$-$$  

• Multiplication $$\times$$  

• Division $$\div$$  

Multiple Choice

Quick Check:

[ minus, difference, less than, decreased by ]

All refers to:

• Addition $$+$$  

• Subtraction $$-$$  

• Multiplication $$\times$$  

• Division $$\div$$  

Multiple Choice

Quick Check:

[ times, multiplied by, product, doubled, tripled ]

All refers to:

• Addition $$+$$  

• Subtraction $$-$$  

• Multiplication $$\times$$  

• Division $$\div$$  

Multiple Choice

Quick Check:

[ divided by, quotient, split into, separated among ]

All refers to:

• Addition $$+$$  

• Subtraction $$-$$  

• Multiplication $$\times$$  

• Division $$\div$$  

Multiple Choice

Translate the following expression

A number added to 10

• x + 10

• x - 10

• 10x

• 10/x

Match

Match the following expressions

• A number times 9

• The difference between a number and 5

• The sum of 25 and a number

• 25 minus a number

• The quotient of 9 and a number

9y

x - 5

25 + x

25 - m

9/y

• 9y

• x - 5

• 25 + x

• 25 - m

• 9/y

Multiple Choice

What is a variable?

• operation of add, subtract, multiply, and divide

• A letter that represents an unknown value

Multiple Select

The order of writing expression will change if we use:

• Fewer than

• Less than

• minus

• times

• the difference

Multiple Choice

Translate the following expression

7 less than a number

• a - 7

• 7 - a

Multiple Choice

Translate the following expression

13 fewer than a number

• a - 13

• 13 - a

Multiple Choice

Translate the following expression

13 minus a number

• a - 13

• 13 - a

Multiple Choice

What do the following terms mean:
is
equal
the same as 

• +

• -

• =

• x

Multiple Choice

A number minus 9 is twelve.

• x - 9 = 12

• 9 - x = 12

• x - 9 = 13

• 9 - x = 14

Multiple Choice

Five times a number is twenty five.

• 3x = 25

• 4x = 25

• 5x = 25

• 6x = 24

Multiple Choice

Five less than a number is thirty-four.

• 5 - n = 36

• n - 5 = 35

• 5 - n = 34

• n - 5 = 34

Real world example

I bought 2 bags of gummy worms for $4.50. Write an equation to represent this situation.

​

2g = 4.50

​

​What does g represent?

Multiple Choice

Which choice models this situation? Abdulrahman had some video games, then bought 4 more.  Now he has a total of 10 games.

• v - 4 = 10

• v + 4 = 10

• 10/4 = v

• 4v = 10

Multiple Choice

Suahim bought a dolphin poster for $12.  He now has $5.  Which choice models this situation?

• m - 12 = 5

• m - 5 = 12

• m + 5 = 12

• m + 12 = 5

Multiple Choice

Ibrahim, Esmael and Rashid want to rent a Speedy Boat that charges QAR 15 deposit fee plus QAR 2 for each hour of use. Write an equation to find out how many hours, they rented the Boat if the total cost was QAR 33.

• h = 2(9) + 15

• 33 = 15h + 2

• h = 15(9) + 2

• 33 = 2h + 15

Multiple Choice

Ghanim is thinking of a number. Nine more than the product of 4 and the number is 73. What is the equation?

• 4 + 9x = 73

• 4x = 73

• 4x + 9 = 73

• 9x + 4 = 73

Multiple Choice

Mubarak is having some books printed. The printer charges $800 plus $5 per book. What equation could help him find how many books can be printed for $4,000?

• 800 + 5x = 4000

• 800x + 5 = 4000

• 4000 + 5x= 800

• 800 + 5 = 4000

Multiple Choice

A banana has 85 calories. This is 10 calories less than one eighth of the calories in a banana split. Which equations helps you find how many calories are in a banana split?

• 85 - 10 = x

• x/8 + 10 = 85

• x/8 - 10 = 85

• x/8 - 10 = 75

Multiple Choice

Khalifa weighs 92 pounds. His weight is 6 pounds more than half of his Friend's weight. Which equation would help him find out how much his Friend weighs?

• 6x + 2 = 92

• x + 6 = 92

• 2x + 6 = 92

• x/2 + 6 = 92

Multiple Choice

The 30 members of a club are trying to raise QAR 1500 to cover travel costs to a sport camp. They have already raised QAR 600. Which equation would you solve to find the average amount each member can raise in order to meet the goal?

• 30x + 600 = 1500

• 30x - 600 = 1500

• x + 600 = 1500

• 30x = 1500

Multiple Choice

Ooredoo company charges $3.00 to make a phone call plus $0.15 for each minute for each minute you talk. Which equation would you use to determine the total cost, c, of a phone call that is m number of minutes long?

• c = 3.00 - 0.15m

• c = 0.15 + 3.00m

• 3.00 = c + 0.15

• c = 3.00 + 0.15m

Multiple Choice

An electrician charges $90 per hour plus a $50 travelling fee. What is the total amount?

• y = 50 - 90x

• y = 90x + 50

• y = -50x + 90

• y = -90 - 50x

Poll

How was this lesson?

• It is like a riddle!

  I love it!

• It was hard but fun!

• I hate it!

• I