Decimals and the Four Basic Operations

Mr. Buffington provides a quick overview of performing basic arithmetic operations with decimals, including addition, subtraction, multiplication, and division. He explains the importance of aligning decimals for addition and subtraction, ignoring decimals during multiplication, and moving decimals for division. The lesson is a brief review, with references to more detailed mini-lessons available for each operation.

What is the first step when adding numbers with decimals?

• Round the numbers

• Add the numbers directly

• Line up the decimals

• Convert to fractions

Tags

CCSS.5.NBT.B.7

In the example 15.6 + 8.52, what should you do after lining up the decimals?

• Add zeros to the shorter number

• Divide the numbers

• Subtract the smaller number from the larger one

• Multiply the numbers

Tags

CCSS.6.NS.B.3

When subtracting decimals, what is the key step to remember?

• Round to the nearest whole number

• Ignore the decimals

• Line up the decimals

• Convert to whole numbers

Tags

CCSS.5.NBT.B.7

In the subtraction example 27.8 - 11.46, what should you do after lining up the decimals?

• Multiply the numbers

• Fill in zeros and subtract

• Divide the numbers

• Add the numbers

Tags

CCSS.5.NBT.B.7

What is the first step in multiplying decimals?

• Line up the decimals

• Round the numbers

• Ignore the decimals

• Convert to fractions

Tags

CCSS.5.NBT.B.7

After multiplying the numbers in a decimal multiplication problem, what should you do next?

• Count the decimal places

• Round the result

• Subtract the decimals

• Add the decimals

Tags

CCSS.5.NBT.B.7

When dividing decimals, what should you do with the decimal points before performing the division?

• Convert to fractions

• Ignore them

• Move them to the right

• Move them to the left

Tags

CCSS.5.NBT.B.6

CCSS.6.NS.B.2

In the division example, what do you do if there are decimals in both the dividend and the divisor?

• Move the decimal in the dividend only

• Move the decimal in the divisor only

• Move the decimals in both

• Ignore the decimals

What is the final step in a division problem involving decimals?

• Add the decimals

• Subtract the decimals

• Perform long division as usual

• Multiply the result by 10

Tags

CCSS.5.NBT.B.6

CCSS.6.NS.B.2

What should you do if you need more detailed steps for any of the operations?

• Guess the steps

• Look up mini lessons

• Ask a friend

• Ignore the details

Tags

CCSS.6.NS.B.3