Percentages and Ratios in Real Life

This video series covers seventh grade illustrative mathematics, focusing on concepts like scaling, ratios, percentages, and measurement errors. Each lesson delves into practical applications, helping students understand and apply mathematical principles in real-world contexts.

If a rectangle has a height to width ratio of 3:4.5, which of the following could be a scaled version of this rectangle?

• 9:12

• 15:20

• 6:9

• 12:15

A cyclist rode 3.75 miles in 0.3 hours. What was her speed in miles per hour?

• 12.5 mph

• 10 mph

• 17.5 mph

• 15 mph

If a bakery used 25% more butter this month than last month, and last month they used 240 kg, how much butter did they use this month?

• 320 kg

• 260 kg

• 280 kg

• 300 kg

A pair of sneakers was bought for $120 and its price increased by 15%. What is the new price?

• $135

• $140

• $138

• $130

In a video game, Claire scored 50% more points than Tyler. If Tyler scored T points, which equation represents Claire's score?

• C = T + 0.5

• C = 1.5T

• C = T + 50

• C = 0.5T + T

If a bakery used 560 kg of sugar last month and 30% more this month, how much sugar did they use this month?

• 600 kg

• 580 kg

• 728 kg

• 700 kg

What is the sales tax rate in Nevada if a $10 item has a sales tax of $0.46?

• 5.0%

• 4.6%

• 5.5%

• 4.0%

A store marks up a guitar by 30% and sells it for $58.50. What was the original price?

• $45

• $50

• $55

• $60

If a thermometer reads 76°F but the actual temperature is 74.51°F, what is the percent error?

• 2.6%

• 1.5%

• 2.0%

• 3.0%

A student estimated a task would take 3 hours, but it took 5 hours. What is the percent error?

• 30%

• 50%

• 20%

• 40%