The video tutorial explains how to use base ten blocks to find the sum of two decimal numbers, two and fifty-eight hundredths and one and ninety-seven hundredths. It defines the blocks as flats, longs, and bits, representing ones, tenths, and hundredths, respectively. The tutorial demonstrates combining these blocks, making exchanges to adjust place values, and calculating the final sum of four and fifty-five hundredths. It also shows how to express this sum in expanded form, connecting the visual representation with the mathematical expression.

What is the purpose of using base ten blocks in this lesson?

• To subtract decimals

• To multiply decimals

• To find the sum of decimals and write it in expanded form

• To divide decimals

In the context of base ten blocks, what does a 'flat' represent?

• One-tenth

• One-hundredth

• One whole

• One-thousandth

How many bits are equivalent to one long?

• Five bits

• Ten bits

• Fifteen bits

• Twenty bits

What is the result of exchanging ten longs in the tenths place?

• One long

• One bit

• One flat

• One hundredth

What is the expanded form of four and fifty-five hundredths?

• 4 + 0.05 + 0.5

• 4 + 0.55 + 0.5

• 4 + 5 + 0.55

• 4 + 0.5 + 0.05