1. Equivalent Expressions40
On Monday Forrest found 9 more insects for his science project. Now he can make a display of all 20 insects. How many insects did he have before Monday?

2. insects found before Monday insects found on Monday
Equivalent Expressions 40
insects found before Monday
insects found on Monday +
= 20 x + 9
= 20

3. Distance = Rate × Time

4. distance =
rate ×
time
d = r × t

5. If a car travels at a rate of 55 mph for 2 hours, how far will it travel?
d = r × t d
= 55
× 2
d = 110
miles

6. The distance that Joseph, Mary, and the young child, Jesus, traveled from Bethlehem to Egypt may have been about 400 miles. If they had traveled 20 miles per day, how long would it have taken them to travel from Bethlehem to Egypt?

7. d = r × t
400
= 20
× t 20 20 20
= t
t = 20 days

8. Henri Giffard built an airship in 1852
Henri Giffard built an airship in 1852. If the airship flew 17 miles in 3.4 hours, how many miles an hour did it travel?
d = r × t 17
= r × 3.4
3.4
3.4
5 = r
r = 5 mph

9. A car traveled 88 kilometers per hour for 2 hours
A car traveled 88 kilometers per hour for 2 hours. How far did it travel?
d = 88
× 2
d = 176
kilometers

10. How long will it take to travel the 450 miles to Uncle Jim’s house if Dad drives at an average speed of 60 miles per hour?
450
= 60 × t 60 60 1 2 =
hours t

11. d = r × t
d = r × t
200
= 10 × t
200 = 20 × t 10 10 20 20
20 = t
10 = t

12. Complete #1−11 on Student Text pp. 228−29.