Dividing Decimals by Whole Numbers

The video tutorial introduces the concept of dividing decimals by whole numbers, focusing on using models to solve problems. It begins with a problem involving dividing 2.4 by 4, demonstrating the use of decimal models to find the solution. The video also discusses mathematical practices and provides an additional example using base 10 blocks to divide 3.21 by 3. The tutorial concludes with a summary of the key points and a farewell to viewers.

What is the essential question of the lesson?

• How can you multiply decimals by whole numbers?

• How do you add decimals?

• How can you use a model to divide a decimal by a whole number?

• What is the perimeter of a square?

Angela has a piece of wood with a perimeter of 2.4 meters. If she wants to make a square frame, what is the length of each side?

• 0.6 meters

• 1.2 meters

• 0.4 meters

• 0.8 meters

Why do we need to cut apart the model when dividing 2.4 by 4?

• Because two wholes cannot be shared among four groups without regrouping.

• Because decimals cannot be divided by whole numbers.

• Because 2.4 is too large to divide directly.

• Because the model is incorrect.

How many tenths are there in 2.4?

• 6 tenths

• 12 tenths

• 4 tenths

• 24 tenths

What is the result of dividing 2.4 by 4?

• 0.7

• 0.6

• 0.5

• 0.4

What tool can be used to model the division of a decimal by a whole number?

• Fraction strips

• Base 10 blocks

• Number lines

• Protractors

Kyle has a roll of ribbon that is 3.21 yards long. If he cuts it into three equal lengths, how long is each piece?

• 1.15 yards

• 1.05 yards

• 1.10 yards

• 1.07 yards

What is the first step in using base 10 blocks to divide 3.21 by 3?

• Regroup the ones into tenths.

• Share the ones equally among three groups.

• Share the tenths equally among three groups.

• Share the hundredths equally among three groups.

What does a 'flat' represent in base 10 blocks?

• Ten

• One hundredth

• One tenth

• One

Why does the answer 1.07 yards make sense when dividing 3.21 by 3?

• Because 1.07 is a whole number.

• Because 3.21 is a multiple of 3.

• Because 3.21 is close to 3, and 3 divided by 3 is 1.

• Because 3.21 divided by 3 is exactly 1.07.