Mastering Operations with Decimals

This video tutorial covers the basic operations with decimals: addition, subtraction, multiplication, and division. It emphasizes the importance of lining up decimal places for addition and subtraction, while explaining that this is not necessary for multiplication. The tutorial also demonstrates how to handle borrowing in subtraction and how to perform division using traditional methods. Each operation is explained with examples, ensuring a clear understanding of decimal arithmetic.

What is the most important part of adding and subtracting decimals?

• Lining up the decimal places

• Ignoring the decimal places

• Starting with the smallest number

• Using a calculator

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CCSS.5.NBT.B.7

When adding 3.4 and 2.78, what placeholder can be added to 3.4 to make the addition easier?

• 0

• 1

• 2

• 3

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CCSS.5.NBT.B.7

What is the result of adding 3.4 and 2.78?

• 6.18

• 6.17

• 6.11

• 6.12

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CCSS.6.NS.B.3

When subtracting 2.78 from 3.4, what must you do if you cannot subtract a digit in the smaller number from the corresponding digit in the larger number?

• Start over

• Ignore the smaller digit

• Add a placeholder zero

• Borrow from the next higher place value

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CCSS.6.NS.B.3

What is the result of subtracting 2.78 from 3.4?

• 0.60

• 0.66

• 0.62

• 0.64

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CCSS.5.NBT.B.7

When multiplying decimals, do you need to line up the decimal places?

• Sometimes

• Only if the numbers are large

• No

• Yes

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CCSS.6.NS.B.3

What is the product of 3.4 and 2.78?

• 9.524

• 9.245

• 9.542

• 9.452

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CCSS.6.NS.B.3

In division of decimals, what should you do before dividing?

• Add placeholders

• Line up the decimal points

• Move the decimal point to make the divisor a whole number

• Subtract the smaller number from the larger number

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CCSS.6.NS.B.3

What is the result of dividing 3.4 by 2.78?

• 1.25

• 1.24

• 1.23

• 1.22

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CCSS.6.NS.B.3

What is the final step in dividing decimals after moving the decimal points?

• Perform the division as with whole numbers

• Add the decimal points back

• Multiply the numbers

• Subtract the numbers

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CCSS.6.NS.B.2

CCSS.5.NBT.B.6