# Lesson 13

Benchmark Percentages

### Problem 1

1. How can you find 50% of a number quickly in your head?

2. Andre lives 1.6 km from school. What is 50% of 1.6 km?

3. Diego lives $$\frac 1 2$$ mile from school. What is 50% of $$\frac 1 2$$ mile?

### Solution

For access, consult one of our IM Certified Partners.

### Solution

For access, consult one of our IM Certified Partners.

(From Unit 3, Lesson 10.)

### Problem 6

Lin and Andre start walking toward each other at the same time from opposite ends of 22-mile walking trail. Lin walks at a speed of 2.5 miles per hour. Andre walks at a speed of 3 miles per hour.

Here is a table showing the distances traveled and how far apart Lin and Andre were over time. Use the table to find how much time passes before they meet.

elapsed time (hour) Lin’s distance (miles) Andre’s distance (miles) distance apart (miles)
0 0 0 22
1 2.5 3 16.5
0

### Solution

For access, consult one of our IM Certified Partners.

(From Unit 3, Lesson 8.)