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Questions and Answers
What is the correct way to subtract decimals?
What is the correct way to subtract decimals?
- Add the decimal points and then subtract the whole numbers
- Line up the decimal points and subtract each place value column (correct)
- Ignore the decimal points and subtract the whole numbers
- Line up the decimal points and add each place value column
Subtracting decimals is used in everyday life, such as calculating change owed to a customer.
Subtracting decimals is used in everyday life, such as calculating change owed to a customer.
True (A)
What is the result of subtracting 2.5 from 8.9?
What is the result of subtracting 2.5 from 8.9?
6.4
When comparing decimal numbers, we first compare the ______________ parts and then the decimal parts.
When comparing decimal numbers, we first compare the ______________ parts and then the decimal parts.
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What is the result of adding 2.8 to 5?
What is the result of adding 2.8 to 5?
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Match the following decimal operations with their real-world applications:
Match the following decimal operations with their real-world applications:
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What does the word 'obliged' mean?
What does the word 'obliged' mean?
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The word 'eerie' is an adjective that means causing feelings of fear or unease.
The word 'eerie' is an adjective that means causing feelings of fear or unease.
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What is the meaning of the word 'peril'?
What is the meaning of the word 'peril'?
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The word 'heartily' is an adverb that means to do something ______________________.
The word 'heartily' is an adverb that means to do something ______________________.
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Match the following words with their meanings:
Match the following words with their meanings:
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Study Notes
Subtracting Decimals
- To subtract decimals, follow the same steps as subtracting whole numbers:
- Line up the decimal points
- Subtract each place value column (right to left)
- Borrow from the next column to the left if necessary
- Example: 9.4 - 2.1 = ?
- Line up the decimal points: 9.4 - 2.1
- Subtract each place value column: 9 - 2 = 7, 0.4 - 0.1 = 0.3
- Result: 9.4 - 2.1 = 7.3
Real-world Applications
- Measuring ingredients for a recipe: subtracting decimals is used to calculate the exact amount of ingredients needed
- Calculating change owed: subtracting decimals is used to calculate the exact change owed to a customer
- Science and engineering: subtracting decimals is used to calculate precise measurements and quantities
Comparing Decimal Numbers
- Compare decimal numbers by comparing the whole number parts and then the decimal parts
- Example: Compare 4.8 and 4.2
- Whole number parts are equal (4)
- Compare decimal parts: 0.8 > 0.2, so 4.8 > 4.2
Adding Decimals With Whole Numbers
- To add decimals with whole numbers, follow the same steps as adding whole numbers:
- Line up the decimal points
- Add each place value column (right to left)
- Carry or regroup to the next column to the left if necessary
- Example: 5 + 3.2 = ?
- Line up the decimal points: 5 + 3.2
- Add each place value column: 5 + 3 = 8, 0.2
- Result: 5 + 3.2 = 8.2
Subtracting Decimals
- To subtract decimals, line up the decimal points and subtract each place value column from right to left.
- Borrow from the next column to the left if necessary.
- Example: 9.4 - 2.1 = 7.3.
Real-World Applications
- Subtracting decimals is used to calculate exact amounts of ingredients in recipes.
- It is used to calculate exact change owed to customers.
- It is used in science and engineering to calculate precise measurements and quantities.
Comparing Decimal Numbers
- Compare decimal numbers by comparing whole number parts and then decimal parts.
- If whole number parts are equal, compare decimal parts.
- Example: 4.8 > 4.2 because 0.8 > 0.2.
Adding Decimals With Whole Numbers
- To add decimals with whole numbers, line up the decimal points and add each place value column from right to left.
- Carry or regroup to the next column to the left if necessary.
- Example: 5 + 3.2 = 8.2.
Subtracting Decimals
- To subtract decimals, line up the decimal points and subtract each place value column from right to left, borrowing from the next column to the left if necessary
- Example: 9.4 - 2.1 = 7.3
Real-world Applications
- Subtracting decimals is used in measuring ingredients for a recipe to calculate the exact amount needed
- Subtracting decimals is used in calculating change owed to a customer
- Subtracting decimals is used in science and engineering to calculate precise measurements and quantities
Comparing Decimal Numbers
- Compare decimal numbers by comparing the whole number parts and then the decimal parts
- If the whole number parts are equal, compare the decimal parts
- Example: 4.8 > 4.2 because 0.8 > 0.2
Adding Decimals With Whole Numbers
- To add decimals with whole numbers, line up the decimal points and add each place value column from right to left, carrying or regrouping to the next column to the left if necessary
- Example: 5 + 3.2 = 8.2
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