7th Grade Math

Lesson 3A Multiply and Divide Integers 101

= Step-by-Step Solutions begin on page R1.

Extra Practice begins on page EP2.

Use the look for a pattern strategy to solve

Exercises 2–4.

2. DISPLAYS A display of cereal boxes is
   stacked as shown below.

If the display contains 7 rows of boxes and

the top three rows are shown, how many

boxes are in the display?

33 FINANCIAL LITERACY Peter is saving money

to buy an MP3 player. After one month, he

has $50. After 2 months, he has $85. After

3 months, he has $120. After 4 months, he

has $155. He plans to keep saving at the

same rate. How long will it take Peter to

save enough money to buy an MP3 player

that costs $295?

4. INSECTS The table shows how many
   times a cricket chirps at different
   temperatures. If this pattern continues,
   about how many times will a cricket chirp
   when the temperature is 60°F?

Outside

Temperature (°F)

Chirps per

Minute

70 120

75 140

80 160

85 180

Use any strategy to solve Exercises 5–10.

5. COINS Adelina has exactly six coins that
   total $0.86. What are the coins?
   6. DIVING The table shows Time
   (min)

Position

(ft)

1 - 15

2 - 30

3 - 45

a diver’s position after

several minutes. If she

keeps descending at

this rate, find the

diver’s position after

ten minutes.

7. GEOMETRY The pattern below is made from
   toothpicks. How many toothpicks would be
   needed for the sixth term in the pattern?

First term Second term Third term

8. GOLF Allie’s golf scores
   for the first five holes are
   given in the table. What is
   her total score after the
   first five holes?

Hole Score

10

21

3 - 1

4 - 2

53

9. NATURE A sunflower usually has two
   different spirals of seeds, one with 34 seeds
   and the other with 55 seeds.

The numbers 34 and 55 are part of the

Fibonacci sequence: 1, 1, 2, 3, 5, 8, 13, 21, 34,

55, .... Find the pattern in the Fibonacci

sequence and identify the next two terms.

10. E WRITE MATH Write a real-world
    problem that could be solved by looking
    for a pattern. Then solve.

• Look for a pattern.


• Guess, check, and revise.


• Make a list.


• Choose an operation.

100_101_PSI_895130.indd 101 12/29/09 12:41 PM