Mastering Decimal Operations: Addition, Subtraction, Multiplication, and Division

This video tutorial by Mr. J provides a comprehensive review of decimal operations, including addition, subtraction, multiplication, and division. Each section offers step-by-step instructions and examples to help viewers understand how to correctly perform these operations. The video emphasizes the importance of lining up decimals for addition and subtraction, removing decimals for multiplication, and adjusting the divisor for division. Estimation is used to verify the reasonableness of answers, ensuring accuracy in decimal calculations.

What are the four operations with decimals covered in this video?

• Addition, Subtraction, Multiplication, Exponentiation

• Addition, Subtraction, Division, Modulus

• Addition, Multiplication, Division, Exponentiation

• Addition, Subtraction, Multiplication, Division

Tags

CCSS.6.NS.B.3

When adding decimals, what is the most important step to ensure accuracy?

• Ignoring placeholder zeros

• Starting from the left

• Lining up the decimal points

• Using a calculator

Tags

CCSS.5.NBT.B.7

Why is it useful to use placeholder zeros when adding decimals?

• To avoid using a calculator

• To make the calculation faster

• To make the numbers look bigger

• To ensure the decimal points are aligned

Tags

CCSS.5.NBT.B.7

In the example of adding 18.4 and 3.97, what is the correct sum?

• 22.37

• 21.37

• 24.37

• 23.37

Tags

CCSS.5.NBT.B.7

What should you do if you cannot subtract a smaller digit from a larger digit in decimal subtraction?

• Borrow from the next left digit

• Ignore the smaller digit

• Add a placeholder zero

• Start the subtraction from the left

Tags

CCSS.5.NBT.B.7

In the example of subtracting 34.6 and 4.864, what is the correct difference?

• 29.736

• 30.736

• 31.736

• 32.736

Tags

CCSS.5.NBT.B.7

How do you handle the decimal points when multiplying decimals?

• Add a placeholder zero

• Count the total number of decimal places in both numbers and place the decimal point in the product accordingly

• Line them up before multiplying

• Ignore them completely

Tags

CCSS.5.NBT.B.7

In the example of multiplying 5.2 and 4.5, what is the correct product?

• 22.40

• 23.40

• 24.40

• 25.40

Tags

CCSS.6.NS.B.3

What is the first step when dividing decimals if the divisor is not a whole number?

• Ignore the decimal point

• Move the decimal point to the right to make it a whole number

• Add a placeholder zero

• Start the division from the left

Tags

CCSS.6.NS.B.2

CCSS.5.NBT.B.6

In the example of dividing 13.76 by 3.2, what is the correct quotient?

• 4.3

• 3.3

• 6.3

• 5.3

Tags

CCSS.6.NS.B.3