Solved Exercises on Measuring Weight Scale in Grade 2

Master measuring weight scale: comparing weights, reading scales, solving problems with units of measurement through these 5 detailed exercises.

Solution: Exercises 1 to 3
1 Reading Weight Scale
Exercise 1
Look at the scale below. What is the weight of the apple?
0
2
4
6
5 kg
🍎
5 kg
Definition:

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

Reading scale method:
  1. Look at the numbers on the scale
  2. Find where the needle points
  3. Read the number where the needle stops
  4. That number is the weight!
Step 1: Look at the scale markings

The scale shows numbers 0, 2, 4, 6. Each mark represents 1 kg.

Step 2: Find where the needle points

The needle is pointing between 4 and 6, exactly at 5 kg.

Step 3: Read the weight

The apple weighs 5 kg because the needle points to 5.

The apple weighs 5 kg
Final answer:

The apple weighs 5 kilograms.

Applied rules:

• Scale Reading: Always read the number where the needle stops

• Units: Remember to include the unit (kg) in your answer

• Accuracy: Look carefully at the exact position of the needle

2 Comparing Weights
Exercise 2
Which is heavier: a 3 kg watermelon or a 5 kg pumpkin?
🍉
3 kg
Watermelon
VS
🎃
5 kg
Pumpkin
Definition:

Heavier: Having more weight than another object. Lighter: having less weight than another object.

Step 1: Identify the weights

Watermelon = 3 kg, Pumpkin = 5 kg

Step 2: Compare the numbers

Compare 3 and 5: 5 is greater than 3

Step 3: Determine which is heavier

Since 5 > 3, the pumpkin is heavier than the watermelon

The pumpkin (5 kg) is heavier than the watermelon (3 kg)
Final answer:

The pumpkin is heavier because 5 kg is greater than 3 kg.

Applied rules:

• Comparison: Compare the numbers to determine which is heavier

• Greater Than: When comparing weights, the larger number means heavier

• Units: Both objects must have the same units for comparison

3 Adding Weights
Exercise 3
Sarah has 2 bags of apples. One bag weighs 4 kg and the other weighs 3 kg. What is the total weight?
🎒
4 kg
Bag 1
+
🎒
3 kg
Bag 2
=
❓
? kg
Total
Definition:

Total Weight: The sum of all individual weights when combined together.

Step 1: Identify the weights to add

Bag 1 = 4 kg, Bag 2 = 3 kg

Step 2: Add the weights together

4 kg + 3 kg = 7 kg

Step 3: State the total weight

The total weight of both bags is 7 kg

4 kg + 3 kg = 7 kg
Final answer:

The total weight is 7 kilograms.

Applied rules:

• Addition: When combining weights, add the numbers together

• Same Units: Make sure both weights have the same unit before adding

• Total: The sum is the combined weight of all objects

Weight Measurement Rules and Methods
Weight = How \space Heavy \space Something \space Is
Weight Definition
Unit: Kilogram
kg
Main unit for measuring weight
Unit: Gram
g
Smaller unit for light objects
Comparison
> or <
Use to compare weights
Key definitions:

Weight: How heavy an object is compared to a standard unit.

Kilogram (kg): The main unit for measuring weight of medium to large objects.

Gram (g): Used for measuring lighter objects.

Complete methodology:
  1. Identify the unit: Look for kg or g in the problem
  2. Read the scale: Find where the needle or marker points
  3. Compare if needed: Use >, <, or = to compare weights
  4. Calculate if needed: Add or subtract weights as required
Tip 1: Remember: 1 kg = 1000 g. Objects under 1 kg are often measured in grams.
Tip 2: Heavier objects have larger numbers when measured in the same unit.
Tip 3: When adding weights, keep the same unit in your final answer.
Common errors: Mixing up kg and g, misreading scale markers, forgetting to include units in answers.
Key concept: The larger the number, the heavier the object (when using the same unit).
Important rules to remember:

• Reading scales: Look at the exact position of the needle or marker

• Comparing: Use numbers to determine heavier/lighter objects

• Adding: Combine weights by adding the numbers

• Units: Always include kg or g in your answers

Solution: Exercises 4 to 5
4 Subtracting Weights
Exercise 4
A box weighs 8 kg. If 3 kg of apples are taken out, how much does the box weigh now?
📦
8 kg
Full Box
-
🍎
3 kg
Apples Removed
=
❓
? kg
Remaining
Definition:

Subtracting Weight: Finding the remaining weight after some amount is removed.

Step 1: Identify the starting weight

The box initially weighs 8 kg

Step 2: Identify the weight removed

3 kg of apples are taken out

Step 3: Subtract the removed weight

8 kg - 3 kg = 5 kg

Step 4: State the remaining weight

The box now weighs 5 kg

8 kg - 3 kg = 5 kg
Final answer:

The box now weighs 5 kilograms.

Applied rules:

• Subtraction: When removing weight, subtract the removed amount

• Same Units: Both weights must have the same unit before calculating

• Remaining: The result is the weight left after removal

5 Ordering by Weight
Exercise 5
Order these animals from lightest to heaviest:
Cat: 4 kg, Dog: 10 kg, Rabbit: 2 kg
🐰
2 kg
Rabbit
🐱
4 kg
Cat
🐶
10 kg
Dog
Definition:

Ordering by Weight: Arranging objects from lightest to heaviest (ascending order) or heaviest to lightest (descending order).

Step 1: List all the weights

Rabbit: 2 kg, Cat: 4 kg, Dog: 10 kg

Step 2: Compare the numbers

Compare 2, 4, and 10: 2 < 4 < 10

Step 3: Arrange from lightest to heaviest

Rabbit (2 kg) → Cat (4 kg) → Dog (10 kg)

Step 4: Present the ordered sequence

Rabbit, Cat, Dog (from lightest to heaviest)

Rabbit (2 kg) < Cat (4 kg) < Dog (10 kg)
Final answer:

From lightest to heaviest: Rabbit (2 kg), Cat (4 kg), Dog (10 kg).

Applied rules:

• Comparison: Compare all weights to determine the order

• Ascending: From smallest number to largest number

• Verification: Check that each next item is heavier than the previous

Complete Guide to Weight Measurement
Weight = How \space Heavy \space Something \space Is
Weight Formula
Key definitions:

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

Kilogram (kg): The main unit for measuring weight of medium to large objects like bags, boxes, people.

Gram (g): Used for measuring lighter objects like food, small toys.

Complete methodology:
  1. Identify the unit: Look for kg or g in the problem
  2. Read the scale: Find where the needle or marker points
  3. Compare if needed: Use >, <, or = to compare weights
  4. Calculate if needed: Add or subtract weights as required
  5. Verify your answer: Check if it makes sense
Tip 1: Remember: 1 kg = 1000 g. Objects under 1 kg are often measured in grams.
Tip 2: Heavier objects have larger numbers when measured in the same unit.
Tip 3: When adding weights, keep the same unit in your final answer.
Tip 4: Always double-check your calculations to avoid mistakes.
Common errors: Mixing up kg and g, misreading scale markers, forgetting to include units in answers.
Key concept: The larger the number, the heavier the object (when using the same unit).
Formulas to know by heart:

• Reading scales: Look at the exact position of the needle or marker

• Comparing: Use numbers to determine heavier/lighter objects

• Adding: Combine weights by adding the numbers

• Subtracting: Remove weight by subtracting the removed amount

• Units: Always include kg or g in your answers

Questions & Answers

Question: I don't understand how to read the scale when the needle is between two numbers. Can you explain how to find the exact weight?

Answer: Great question! Here's how to read a scale when the needle is between numbers:

  • Look at the two closest numbers the needle is between
  • Notice if there are smaller marks between the big numbers
  • Count how many small marks there are between the big numbers
  • If there are 2 small marks between each big number, each small mark is worth 0.5 units
  • If there are 4 small marks between each big number, each small mark is worth 0.25 units

For example, if the needle is halfway between 4 and 6, it points to 5. If it's one small mark after 4 (where each small mark is 0.5), it points to 4.5.

Always look carefully at the spacing between the marks to determine the value of each small increment!

Question: How do I know when to use kilograms (kg) versus grams (g) when measuring weight?

Answer: The choice between kg and g depends on the size of the object:

  • Kilograms (kg): Use for medium to large objects like bags of rice, people, furniture, boxes
  • Grams (g): Use for small, light objects like pieces of fruit, small toys, food portions
  • Rule of thumb: If an object weighs less than 1 kg, it's usually measured in grams

Examples:

  • A bag of sugar: 1 kg
  • An apple: 150 g
  • A person: 30 kg
  • A pencil: 10 g

Remember: 1 kg = 1000 g, so if you have 1000 g, that equals 1 kg!

Question: When comparing weights, how do I remember which symbol means greater than and which means less than?

Answer: There's a helpful memory trick for these symbols:

  • Greater than (>): The wide open side faces the larger number: 5 > 3 (5 is greater than 3)
  • Less than (<): The narrow point faces the smaller number: 3 < 5 (3 is less than 5)
  • Memory tip: Think of the symbol as a hungry mouth that wants to eat the bigger number!

Examples:

  • 7 kg > 4 kg (7 kg is greater than 4 kg)
  • 2 kg < 6 kg (2 kg is less than 6 kg)
  • 5 kg = 5 kg (5 kg is equal to 5 kg)

Practice with different weight comparisons to get comfortable with these symbols!