Name *
In 1 through 4, solve each equation.
5. What question can you answer to help solve the equation in Exercise 1?
1. n + 500 = 2,000 6. What could you ask yourself to help you solve the equation in Exercise 4?
2. x - 2 = 18 3. 2,000 × y = 14,000 4. 16,000 , z = 80
You can substitute the value of the variable into the equation to check your answer.
Use compatible numbers to help you.
Leveled Practice In 7 and 8, enter the missing numbers to solve each equation. 7. v + 550 = 8,000
8. 4,200 , n = 70
+ 550 = 600
4,200 ,
= 700
+ 600 = 8,000
4,200 ,
= 70
+ 550 = 8,000
So, n =
So, v =
.
.
In 9 through 17, solve each equation. 9. b + 1,600 = 5,000
10. 500 × r = 25,000
11. 18 , a = 6
12. 400 + x = 6,800
13. 90 × r = 810
14. x - 4,200 = 8,000
15. 4,000 , z = 500
16. x - 80 = 440
17. 3,000 × y = 27,000
*For another example, see Set E on page 561.Digital Resources at PearsonTexas.com
Topic 10 Lesson 10-7
541
For 18 through 20, use the table. Rings of Saturn
Distance from Planet
A
122,200 km
B
92,000 km
C
74,500 km
D
66,900 km
DATA
18. Math and Science The rings of Saturn are made of chunks and particles of ice and rocks, all orbiting the planet. How many kilometers longer is the distance of the B ring from Saturn than the distance of the C ring? 19. A spacecraft flies from the D ring of Saturn to the A ring. How many kilometers does it travel?
20. How much farther away from Saturn is ring A than ring B?
21. Reason Kelly paid a $2.10 fine for returning a library book d days late. The library charges $0.15 per day for late returns. Write an equation which describes how many days she was charged for late fees.
22. Communicate Explain how to solve the equation below. x + 1,500,000 = 4,000,000
23. Pat saved 2,500 pennies. He wants to put the pennies into piles of 50. How many piles will he have?
24. Extend Your Thinking Without solving, determine whether the solution to the equation 32,531 , y = 160 is greater than or less than 200. Explain.
A 5
C 125
B 50
D 500
25. Kara sold 134 pizza kits for a fundraiser. Fifty-six of the kits were cheese pizza kits and the rest were pepperoni pizza kits. How much money did Kara raise in all?
542
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