Calculating Volume and Costs

This video tutorial by Mr. Richards covers grade six practice problems on adding and subtracting decimals with few non-zero digits. It includes using base-10 diagrams for subtraction, addressing common misconceptions, and solving practical application problems. The lesson emphasizes the importance of decimal alignment and unbundling in calculations.

What is the first step when you cannot subtract a smaller decimal from a larger one in the hundredths place?

• Add more hundredths

• Unbundle a tenth into hundredths

• Unbundle a hundredth into tenths

• Subtract directly

When adding decimals, why is it important to align the decimal points?

• To avoid carrying over

• To ensure the numbers are in the correct place value

• To make the numbers look neat

• To simplify the addition process

In the subtraction of 1.97 from 20, what is the first step to handle the decimal places?

• Add zeros to 20

• Subtract directly

• Convert 1.97 to a whole number

• Ignore the decimal places

What is the correct way to handle borrowing when subtracting decimals?

• Ignore the borrowing

• Borrow from the next higher place value

• Subtract from the next lower place value

• Add to the next lower place value

If a hat costs $14.50 and two binders cost $6.40, what is the total cost?

• $20.90

• $22.00

• $21.00

• $19.90

How many pencils can you buy for $5 if each pencil costs $0.32?

• 15

• 16

• 13

• 14

How do you calculate the number of half-centimeter cubes that fit along a side of a prism?

• Multiply the side length by 2

• Subtract 0.5 from the side length

• Divide the side length by 0.5

• Add 0.5 to the side length

What is the volume of a rectangular prism with dimensions 7.5 cm, 12 cm, and 15.5 cm?

• 1350 cubic centimeters

• 1400 cubic centimeters

• 1500 cubic centimeters

• 1395 cubic centimeters

If a car travels 75 miles in 60 minutes, how far does it travel in 18 minutes?

• 18 miles

• 20 miles

• 22.5 miles

• 25 miles

What is the first step in finding the volume of a prism using its dimensions?

• Divide the dimensions

• Add the dimensions

• Multiply the dimensions

• Subtract the dimensions