Solved Exercises on Measuring Weight in Grade 2

Master measuring weight: units, comparisons, conversions, and practical applications through these 5 detailed exercises.

Solution: Exercises 1 to 3
1 Comparing weights
Exercise 1
Which is heavier? Circle the heaviest object:
🍎 Apple = 150 grams
🍌 Banana = 120 grams
🍊 Orange = 180 grams
Definition:

Weight: How heavy something is. We measure weight in grams (g) and pounds (lb).

Comparison: Look at the numbers and find the biggest one.

Comparison method:
  1. Look at all the weights
  2. Compare the numbers
  3. Circle the biggest number
Weights
150g, 120g, 180g
Order
120g < 150g < 180g
Step 1: List all weights

Apple = 150g, Banana = 120g, Orange = 180g

Step 2: Compare the numbers

120 vs 150 vs 180

Step 3: Find the biggest number

180 is bigger than 150 and 120

🍊 Orange = 180 grams (heaviest)
Final answer:

The orange is the heaviest at 180 grams

Applied rules:

• Comparison: Bigger number means heavier object

• Units: Same unit (grams) for easy comparison

• Ordering: Arrange from lightest to heaviest

2 Adding weights
Exercise 2
Sarah has 2 bags of apples.
Bag 1 weighs 3 pounds
Bag 2 weighs 2 pounds
What is the total weight?
Definition:

Total weight: Add all individual weights together.

Addition: Combine amounts to get the whole.

Weights
3 lb + 2 lb
Addition
5 lb
Step 1: Identify each weight

Bag 1 = 3 pounds, Bag 2 = 2 pounds

Step 2: Add the weights together

3 + 2 = 5

Step 3: Include the unit

5 pounds

Total weight = 5 pounds
Final answer:

The total weight is 5 pounds

Applied rules:

• Addition: Combine like units (pounds + pounds)

• Same units: Always check units match before adding

• Label: Don't forget to write the unit in the answer

3 Understanding units
Exercise 3
Fill in the correct unit:
A car weighs about 2,000 ____.
A pencil weighs about 5 ____.
A water bottle weighs about 1 ____.
Definition:

Weight units: Grams (g) for light objects, Pounds (lb) for medium objects, Kilograms (kg) for heavy objects.

Light objects
Grams (g)
Medium objects
Pounds (lb)
Heavy objects
Kilograms (kg)
Step 1: Think about how heavy each object is

Car = very heavy, Pencil = very light, Water bottle = medium

Step 2: Match object to appropriate unit

Heavy objects use pounds or kilograms, light objects use grams

Step 3: Fill in the units

Car = pounds, Pencil = grams, Water bottle = pounds

Car: 2,000 lb
Pencil: 5 g
Water bottle: 1 lb
Final answer:

Car = 2,000 pounds, Pencil = 5 grams, Water bottle = 1 pound

Applied rules:

• Unit selection: Use grams for light things, pounds for medium things

• Estimation: Think about familiar objects to estimate weight

• Common sense: A car is too heavy for grams!

Weight Units and Measurement Methods
1 pound = 16 ounces
Weight Conversion
Light Objects
Grams (g)
Pencils, paper clips, coins
Medium Objects
Pounds (lb)
Books, bags, people
Heavy Objects
Kilograms (kg)
Cars, furniture, appliances
Key definitions:

Weight: How heavy something is due to gravity

Mass: Amount of matter in an object (measured in grams/kilograms)

Scale: Tool used to measure weight

Measurement methodology:
  1. Choose the right tool: Kitchen scale for small items, bathroom scale for people
  2. Select appropriate units: Grams for light objects, pounds for medium objects
  3. Read the measurement: Look at the numbers on the scale
  4. Record the weight: Write down the number and unit
Tip 1: Remember: 1 pound = 16 ounces, 1 kilogram ≈ 2.2 pounds
Tip 2: Use benchmarks: A slice of bread weighs about 1 ounce
Tip 3: Always read the scale carefully and record the unit
Tip 4: Estimate first, then measure to check your guess
Common weights: Apple ≈ 150g, Book ≈ 1lb, Person ≈ 50kg
Measurement tools: Digital scales, analog scales, balance scales
Weight measurement facts:

• Light objects: measured in grams (g)

• Medium objects: measured in pounds (lb)

• Heavy objects: measured in kilograms (kg)

• Always match the unit to the object size

• 1 pound = 16 ounces

Solution: Exercises 4 to 5
4 Word problem
Exercise 4
Tom bought 3 pounds of apples and 2 pounds of oranges. His sister bought 1 pound of grapes. How much fruit did they buy altogether?
Definition:

Word problems: Real-life situations that require math to solve.

Altogether: Means to add everything together.

Tom's fruit
3 lb + 2 lb
Sister's fruit
1 lb
Total
6 lb
Step 1: Find Tom's total

Apples: 3 pounds + Oranges: 2 pounds = 5 pounds

Step 2: Add sister's amount

Tom: 5 pounds + Sister: 1 pound = 6 pounds

Step 3: Check all units match

All measurements are in pounds, so we can add them

3 + 2 + 1 = 6 pounds
Final answer:

They bought 6 pounds of fruit altogether

Applied rules:

• Problem solving: Break into smaller parts

• Addition: Combine like units

• Keywords: "Altogether" means addition

5 Converting units
Exercise 5
If 1 pound equals 16 ounces, how many ounces are in 2 pounds?
Definition:

Conversion: Changing from one unit to another.

Multiplication: Repeated addition (2 pounds = 16 + 16)

Given
1 lb = 16 oz
Multiply
2 × 16 oz
Result
32 oz
Step 1: Know the conversion

1 pound = 16 ounces

Step 2: Multiply by the number of pounds

2 pounds = 2 × 16 ounces

Step 3: Calculate

2 × 16 = 32

Step 4: Add the unit

32 ounces

2 pounds = 32 ounces
Final answer:

There are 32 ounces in 2 pounds

Applied rules:

• Conversion factor: Use given relationship (1 lb = 16 oz)

• Multiplication: Multiply by the number of units

• Verification: 2 pounds should equal 32 ounces

Weight Measurement Fundamentals and Techniques
Weight = Mass × Gravity
Weight Formula
Key definitions:

Weight: Force exerted by gravity on an object (measured in pounds or grams)

Mass: Amount of matter in an object (measured in grams or kilograms)

Scale: Instrument used to measure weight

Complete methodology:
  1. Identify the object: Determine what needs to be weighed
  2. Select appropriate unit: Choose grams for light, pounds for medium, kg for heavy
  3. Use proper tool: Kitchen scale, bathroom scale, or balance scale
  4. Read measurement: Note the number and unit displayed
  5. Record result: Write down the weight with correct unit
Tip 1: Always zero the scale before placing objects on it.
Tip 2: Place objects gently on the scale to avoid damage.
Tip 3: When comparing weights, make sure units are the same.
Tip 4: Estimate weight before measuring to check if reading makes sense.
Common weight benchmarks: Paperclip = 1 gram, Slice of bread = 1 ounce, Baseball = 5 ounces
Conversion relationships: 16 oz = 1 lb, 1000 g = 1 kg, 2.2 lbs ≈ 1 kg
Weight measurement rules to remember:

• Use grams for light objects (paper clips, coins)

• Use pounds for medium objects (books, bags)

• Use kilograms for heavy objects (people, furniture)

• Always include the unit when recording weight

• 1 pound = 16 ounces

• 1 kilogram = 1000 grams

Visualizing Weight Comparisons
Exercise 6: Weight Comparison Chart
Objects and their approximate weights:
Feather: 0.1 grams
Apple: 150 grams
Loaf of bread: 1 pound
Adult: 150 pounds

Analysis: The chart shows how weight varies dramatically across different objects.

  • Feather: 0.1 grams (very light)
  • Apple: 150 grams (medium light)
  • Bread: 1 pound (medium heavy)
  • Adult: 150 pounds (very heavy)

Questions & Answers

Question: I don't understand why we use different words for weight like grams and pounds. Why can't we just use one word?

Answer: Great question! We use different units because some objects are very light and others are very heavy:

  • If we tried to weigh a feather in pounds, it would be 0.0002 pounds, which is hard to understand.
  • If we tried to weigh a person in grams, it would be 68,000 grams, which is also hard to understand.
  • Using appropriate units makes numbers easier to work with.

Think of it like this: we use inches for small distances (like your pencil) and miles for large distances (like between cities). It's the same idea with weight!

In science class, you'll learn that grams and kilograms are part of the metric system, while pounds are part of the imperial system.

Question: How do I know if something weighs 1 pound or 16 ounces? Are they the same thing?

Answer: Yes, 1 pound and 16 ounces are exactly the same weight! They are just different ways of expressing the same amount:

  • 1 pound = 16 ounces (this is a fact we memorize)
  • It's like saying 1 foot = 12 inches or 1 dollar = 100 cents
  • These are called conversion factors

If you have 1 pound of candy, you could also say you have 16 ounces of candy. It's the exact same amount, just expressed differently.

To convert pounds to ounces, multiply by 16. To convert ounces to pounds, divide by 16.

Question: What's the difference between weight and mass? My older brother says they're different.

Answer: Your brother is right! Weight and mass are different concepts:

  • Mass: How much matter (stuff) is in an object. This stays the same everywhere.
  • Weight: How hard gravity pulls on that object. This changes depending on where you are.

For example, if you have a 10-pound dog on Earth, it would weigh less on the Moon (about 1.6 pounds) because the Moon's gravity is weaker. But the dog's mass (amount of matter) would stay the same.

In everyday life, we often use "weight" when we really mean "mass," but in science, the distinction is important.

For now, just think of weight as "how heavy something feels" and mass as "how much stuff is in it."