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Course 2, Chapter 3 PSI Subtract. 1. 4 + (−5) 2. −14 − 34 3. −45 − (−8) Evaluate each expression if a = −2, b = 3, and c = −1 4. c − b 5. 9 − a 6. What is −4 subtracted from −3?
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Course 2, Chapter 3 PSI
Subtract.
1. 4 + (−5)
2. −14 − 34
3. −45 − (−8)
Evaluate each expression if a = −2, b = 3, and c = −1
4. c − b
5. 9 − a
6. What is −4 subtracted from −3?
Course 2, Chapter 3 PSI
ANSWERS
1. −1
2. −48
3. −37
4. −4
5. 11
6. C
WHAT happens when you add, subtract, multiply, and divide integers?
Course 2, Chapter 3 PSI
The Number System
• The Look For a Pattern problem-solving strategy to find patterns in mathematical situations
Course 2, Chapter 3 PSI
The Number System
Course 2, Chapter 3 PSI
The Number System
Course 2, Chapter 3 PSI
Course 2, Chapter 3 PSI
Case #3 NatureA 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. Read the problem. What are you being asked to find?
What is your strategy to solve this problem?
Use your strategy to solve the problem.
Does your answer make sense? Use information from the problem to check your answer.
The Number System
Course 2, Chapter 3 PSI
Case #4 Financial LiteracyPeter 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.
At this rate, how long will it take Peter to save enough money to buy an MP3 player that costs $295?
Read the problem. What are you being asked to find?
What is your strategy to solve this problem?
Use your strategy to solve the problem.
Does your answer make sense? Use information from the problem to check your answer.
The Number System
Course 2, Chapter 3 PSI
Case #5 GeometryThe pattern at the right is made from toothpicks.
How many toothpicks would be needed for the sixth term in the pattern?
Read the problem. What are you being asked to find?
What is your strategy to solve this problem?
Use your strategy to solve the problem.
Does your answer make sense? Use information from the problem to check your answer.
The Number System
Course 2, Chapter 3 PSI
Case #6 DivingA diver descends to –15 feet after 1 minute, –30 feet after 2 minutes, and –45 feet after 3 minutes.
If she keeps descending at this rate, find the diver’s position after ten minutes.
Read the problem. What are you being asked to find?
What is your strategy to solve this problem?
Use your problem-solving strategy to solve the problem.
Does your answer make sense? Use information from the problem to check your answer.
The Number System
