Let's solve each of the
integer word problems step by step and explain the reasoning behind each answer.
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Problem 1:
If 0 is sea level, how would ninety nine feet below sea level be written?
- Sea level is represented as
0.
- Below sea level means
negative values.
- So, 99 feet
below sea level =
–99 feet.
✔ Answer: –99
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Problem 2:
When Raphael woke up, his temperature was 105° F. His mom gave him Crocin immediately and an hour later it was 4° lower. What was his temperature then?
- Initial temperature = 105°F
- Temperature dropped by 4°F → subtract 4 from 105.
- $ 105 - 4 = 101 $
✔ Answer: 101°F
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Problem 3:
A fisherman is pulling a big fish at the rate of 30 feet per minute. The fish is 90 feet below sea level. How deep was the fish 4 minutes ago?
- The fish is being pulled
upward at 30 feet per minute.
- So,
4 minutes ago, the fish was
lower than it is now (because it has been rising).
- In 4 minutes, the fish has risen:
$ 30 \text{ ft/min} \times 4 \text{ min} = 120 \text{ feet} $
- Current depth = 90 feet below sea level = –90 feet
- So, 4 minutes ago, the fish was
120 feet deeper than now:
$ -90 - 120 = -210 $ feet
✔ Answer: 210 feet below sea level or
–210 feet
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Problem 4:
An elevator is on the sixteenth floor. It goes down seven floors and then up 3 floors. What floor is the elevator on now?
- Start: 16th floor
- Goes down 7 floors: $ 16 - 7 = 9 $
- Then goes up 3 floors: $ 9 + 3 = 12 $
✔ Answer: 12th floor
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Problem 5:
Diego has $575 in his savings bank account. If he writes a cheque of $100 to Akshayapatra as a donation, how much money will be left in his account now?
- Initial amount = $575
- Subtract $100 for the cheque:
$ 575 - 100 = 475 $
✔ Answer: $475
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✔ Final Answers:
1.
–99
2.
101°F
3.
–210 feet (or 210 feet below sea level)
4.
12th floor
5.
$475
These problems involve understanding
positive and negative integers in real-life contexts like elevation, temperature, movement, and money. Each scenario uses addition or subtraction of integers based on direction or change.
Parent Tip: Review the logic above to help your child master the concept of integer word problems worksheet.
