Lesson 4: Practice Problems

Problem 1

A bakery used 25% more butter this month than last month. If the bakery used 240 kilograms of butter last month, how much did it use this month?

Problem 2

Last week, the price of oranges at the farmer’s market was $1.75 per pound. This week, the price has decreased by 20%. What is the price of oranges this week?

Problem 3

Noah thinks the answers to these two questions will be the same. Do you agree with him? Explain your reasoning.

This year, a herd of bison had a 10% increase in population. If there were 550 bison in the herd last year, how many are in the herd this year?
This year, another herd of bison had a 10% decrease in population. If there are 550 bison in the herd this year, how many bison were there last year?

Problem 4 From Unit 6 Lesson 2

Elena walked 12 miles. Then she walked 0.25 that distance. How far did she walk all together? Select all that apply.

$12 + 0.25 \cdot 12$
$12 (1 + 0.25)$
$12 \cdot 1.25$
$12 \cdot 0.25$
$12 + 0.25$

Problem 5

A circle’s circumference is 600 m. What is a good approximation of the circle’s area?

300 m²
3,000 m²
30,000 m²
300,000 m²

Problem 6 From Unit 5 Lesson 3

The equation $d = 3 t$ represents the relationship between the distance ( $d$ ) in inches that a snail is from a certain rock and the time ( $t$ ) in minutes.

What does the number 3 represent?
How many minutes does it take the snail to get 9 inches from the rock?
How far will the snail be from the rock after 9 minutes?