Writing Expressions for Percent Problems

Mr. Buffington's tutorial covers writing percent word problems as expressions, starting with converting percents to decimals. The lesson progresses from beginner expressions to more challenging questions involving discounts, bulk purchases, and increasing value. Key concepts include using decimals for percents, understanding multiplication in expressions, and simplifying expressions. The tutorial emphasizes the importance of these skills for solving equations.

How would you write 43% as a decimal?

• 0.043

• 0.43

• 43.0

• 4.3

What is the correct decimal representation of 115%?

• 0.115

• 1.15

• 11.5

• 115.0

How would you express 25% of a number 'n' as an expression?

• 0.25 + n

• 25 * n

• 0.25 * n

• n / 0.25

What is the best way to write 8% of 'Y' as an expression?

• 0.8Y

• 8Y

• Y/0.08

• 0.08Y

If a shoe is on sale for 25% off, how would you write the expression for the amount saved?

• 0.25S

• S - 0.25S

• 0.75S

• S + 0.25S

How would you write the expression for the cost of a shoe after a 25% discount?

• S - 0.25S

• 0.75S

• S + 0.25S

• 0.25S

If you buy 20 chocolate bars with a 15% discount, what is the expression for the total cost?

• 20 * 0.85C

• 20 * (C - 0.15C)

• 17C

• 20C - 0.15C

How would you simplify the expression 20 * (C - 0.15C)?

• 20C

• 20 * 0.85C

• 20C - 0.15C

• 17C

If a rock increases in value by 12.5%, how would you write the new value as an expression?

• R + 0.125R

• R - 0.125R

• 1.125R

• 0.125R

What does the expression 1.125R represent in terms of percentage increase?

• 112.5% of the original value

• 12.5% of the original value

• 1.25% of the original value

• 125% of the original value