Solved Exercises on Temp-Test Thermometer in Grade 2

Master thermometer reading: identifying, comparing, and interpreting temperatures through these 5 detailed exercises.

Solution: Exercises 1 to 3
1 Reading Thermometer
Exercise 1
Look at the thermometer. What temperature does it show?
The red line is between 60°F and 70°F, closer to 60°F.
Temperature: _____°F
Definition:

Thermometer: A tool that measures how hot or cold something is

Reading: Finding the number where the red line stops

Degree (°F): The unit we use to measure temperature

Reading method:
  1. Look at the thermometer with the red line
  2. Find the numbers on the side (60°F, 70°F, etc.)
  3. See where the red line stops between the numbers
  4. Estimate the temperature if it's between two numbers
Red Line Position
Between 60°F and 70°F
Closer To
60°F
Estimated
62°F
Step 1: Observe the thermometer

The red line is between 60°F and 70°F marks

Step 2: Determine position

The red line is closer to 60°F than to 70°F

Step 3: Estimate the temperature

About 2 marks above 60°F, so approximately 62°F

The thermometer shows approximately 62°F
Final answer:

The temperature is 62°F

Applied rules:

• Read the number where red line stops

• If between numbers, estimate halfway points

• Always include the degree symbol (°F)

2 Comparing Temperatures
Exercise 2
Which thermometer shows the higher temperature?
Thermometer A shows 75°F
Thermometer B shows 82°F
Higher: ☐ Thermometer A ☐ Thermometer B
Definition:

Comparing: Looking at two numbers to see which is bigger

Higher: The bigger number means hotter temperature

Lower: The smaller number means colder temperature

Thermometer A
75°F
Thermometer B
82°F
Comparison
82°F > 75°F
Step 1: Identify both temperatures

Thermometer A = 75°F and Thermometer B = 82°F

Step 2: Compare the numbers

82 is bigger than 75

Step 3: Determine which is higher

Since 82°F > 75°F, Thermometer B shows higher temperature

82°F > 75°F, so Thermometer B is higher
Final answer:

Thermometer B (82°F) shows the higher temperature

Applied rules:

• Bigger number = higher temperature

• Smaller number = lower temperature

• Compare numbers directly

3 Temperature Difference
Exercise 3
The morning temperature was 58°F. At noon it was 74°F. How much did the temperature rise?
Morning: 58°F
Noon: 74°F
Rise: _____°F
Definition:

Difference: How much bigger one number is than another

Rise: When temperature goes up (addition)

Fall: When temperature goes down (subtraction)

Noon Temp
74°F
Morning Temp
58°F
Difference
16°F
Step 1: Identify starting temperature

Morning temperature = 58°F

Step 2: Identify ending temperature

Noon temperature = 74°F

Step 3: Calculate the difference

74°F - 58°F = 16°F

74°F - 58°F = 16°F
Final answer:

The temperature rose by 16°F

Applied rules:

• To find rise: Subtract starting from ending

• Higher temperature - Lower temperature = Rise

• Always include the unit (°F)

Thermometer Reading Rules and Methods
Higher Number = Hotter Temperature
Temperature Principle
Freezing Point
32°F
Water turns to ice
Body Temperature
98.6°F
Normal human temperature
Room Temperature
~70°F
Comfortable inside
Key definitions:

Temperature: How hot or cold something feels

Thermometer: Tool with a red line to measure temperature

Degree Fahrenheit (°F): Unit for measuring temperature

Reading: Finding the temperature number

Reading method:
  1. Look at the thermometer: Find the red liquid line
  2. Find the numbers: Locate degree marks on the side
  3. Read the position: See where red line stops
  4. Record the number: Write the temperature with °F
Tip 1: The red line goes up when it's hotter, down when it's colder
Tip 2: If the red line is between two numbers, pick the number it's closest to
Tip 3: Always remember to write the degree symbol (°F) after the number
Common temperatures: Ice = 32°F, Room = ~70°F, Body = 98.6°F, Boiling = 212°F
Solution: Exercises 4 to 5
4 Ordering Temperatures
Exercise 4
Arrange these temperatures from coldest to hottest:
45°F, 68°F, 32°F, 80°F, 55°F
Coldest: _____, _____, _____, _____, _____ :Hottest
Definition:

Ordering: Putting numbers from smallest to biggest

Coldest: Lowest temperature (smallest number)

Hottest: Highest temperature (biggest number)

Numbers
45°F, 68°F, 32°F, 80°F, 55°F
Ordered
32°F, 45°F, 55°F, 68°F, 80°F
Result
Coldest to Hottest
Step 1: List all temperatures

45°F, 68°F, 32°F, 80°F, 55°F

Step 2: Find the smallest number

32°F is the smallest

Step 3: Find the next smallest

45°F is the next smallest

Step 4: Continue ordering

55°F, then 68°F, then 80°F

32°F, 45°F, 55°F, 68°F, 80°F
Final answer:

From coldest to hottest: 32°F, 45°F, 55°F, 68°F, 80°F

Applied rules:

• Start with the smallest number

• Put numbers in order from low to high

• Check your work by going back

5 Real World Thermometer
Exercise 5
Emma checked the temperature of different places:
Refrigerator: 38°F
Kitchen: 72°F
Outside: 55°F
Hot bath: 100°F
Which place is the coldest? Which is the hottest?
Definition:

Comparison: Looking at numbers to see which is biggest or smallest

Hottest: The place with the highest temperature number

Coldest: The place with the lowest temperature number

Temperatures
38°F, 72°F, 55°F, 100°F
Hottest
100°F
Coldest
38°F
Step 1: List all temperatures

Refrigerator = 38°F, Kitchen = 72°F, Outside = 55°F, Hot bath = 100°F

Step 2: Find the biggest number

100°F is the biggest number, so hot bath is hottest

Step 3: Find the smallest number

38°F is the smallest number, so refrigerator is coldest

Step 4: Check the order

38°F < 55°F < 72°F < 100°F

Hottest: 100°F (hot bath), Coldest: 38°F (refrigerator)
Final answer:

Hottest: Hot bath (100°F), Coldest: Refrigerator (38°F)

Applied rules:

• Higher number = hotter temperature

• Lower number = colder temperature

• Always compare all numbers to find extremes

Thermometer Laws, Methods, Rules, and Definitions
Read → Compare → Calculate
Temperature Process
Key definitions:

Temperature: Measurement of how hot or cold something is

Thermometer: Instrument with a red liquid line to measure temperature

Degree Fahrenheit (°F): Unit of temperature measurement

Reading: Identifying the temperature number on the thermometer

Comparison: Looking at two or more temperatures to see differences

Complete methodology:
  1. Read the thermometer: Find where the red line stops on the scale
  2. Identify the number: Look at the nearest marked degree
  3. Record with units: Write the number followed by °F
  4. Compare if needed: Use greater than (>) or less than (<) symbols
Tip 1: Remember: The red line moves up when it gets hotter and down when it gets colder.
Tip 2: If the red line is between two numbers, round to the closest number.
Tip 3: Bigger numbers always mean hotter temperatures.
Tip 4: Always write the degree symbol (°F) with temperature measurements.
Common errors: Forgetting units, reading the wrong number, confusing higher numbers with colder temperatures, misreading between marked numbers.
Memory aids: "Red line up = hotter", "Red line down = colder", "Bigger number = hotter temperature".
Temperature facts to remember:

• Freezing point of water: 32°F

• Normal human body temperature: 98.6°F

• Average room temperature: 70°F

• Boiling point of water: 212°F

• Higher numbers = hotter temperatures

Temperature Visualization: Weekly Weather
Exercise 6: Weekly Temperature Patterns
Consider the following weekly temperatures:
Monday: 65°F
Tuesday: 70°F
Wednesday: 68°F
Thursday: 72°F
Friday: 75°F

Analysis: The chart shows how temperature changes throughout the week.

  • Friday (75°F) is the hottest day of the week
  • Monday (65°F) is the coolest day of the week
  • Temperature generally increases from Monday to Friday

Questions & Answers

Question: My child is having trouble reading thermometers when the red line falls between two numbers. How can I help them estimate?

Answer: Here are effective strategies for estimating temperatures between marked numbers:

  • Teach them to divide the space between two numbers into equal parts (usually halves or quarters)
  • Use visual aids: if between 60°F and 70°F, the halfway point would be about 65°F
  • Practice with real thermometers showing various positions between marked numbers
  • Encourage rounding to the nearest marked number when uncertain

The key is developing spatial reasoning skills to estimate where the red line falls in relation to the marked numbers.

Question: Why does the red line in the thermometer go up when it's hot and down when it's cold?

Answer: Great question! Here's how thermometers work:

  • The red liquid (usually alcohol or mercury) expands when heated
  • As it gets hotter, the liquid takes up more space and moves up the tube
  • When it gets colder, the liquid contracts (gets smaller) and moves down
  • This is why the red line shows higher numbers when it's hotter

The thermometer uses the physical principle that materials expand when heated and contract when cooled!

Question: What happens if the temperature goes below 0°F? Does the red line go underground?

Answer: Good thinking! Here's what happens:

  • Most thermometers for kids have markings that go below zero (negative numbers)
  • The red line continues down but shows negative temperatures like -5°F or -10°F
  • Some thermometers stop at 0°F, but scientific ones continue to show very cold temperatures
  • Even at very cold temperatures, the liquid doesn't freeze in a regular thermometer

Negative temperatures just mean it's colder than the freezing point of water (32°F)!