Writing Equations to Solve Word Problems

The video tutorial teaches how to solve word problems by writing equations. It covers using letters to represent unknowns, solving subtraction, multiplication, and division problems using visual aids like bars, and verifying answers through estimation and compatible numbers. The tutorial emphasizes understanding the logic behind equations and ensuring solutions are reasonable.

What is a common mistake when using letters in equations?

• Using a letter that is not related to the object

• Forgetting to use a letter at all

• Placing the letter in the wrong part of the equation

• Using more than one letter in an equation

In the problem where Ann sold cars, why does the equation 7 - k = 11 not make sense?

• Because k should be a positive number

• Because the result is greater than the starting number

• Because 7 is not a valid number of cars

• Because subtraction is not the correct operation

How do you represent the remaining length of a board after cutting in an equation?

• By using a number directly

• By using a blank space

• By using a letter like B

• By using a question mark

What is the estimated result of 83 minus 57 using rounding?

• 15

• 25

• 30

• 20

When solving the water cooler problem, why is multiplication used?

• Because the coolers are different sizes

• Because there are multiple groups of the same amount

• Because addition is not allowed

• Because division is not suitable

What is the estimated total liters of water for 5 coolers using compatible numbers?

• 130 liters

• 140 liters

• 135 liters

• 125 liters

How much does each friend pay for the popcorn if the total cost is $135?

• $1.35

• $0.45

• $4.50

• $45