Subtracting Decimals with Base-Ten Blocks

What is the purpose of using base 10 blocks in this lesson?

• To represent fractions

• To represent whole numbers and decimals

• To represent algebraic expressions

• To represent percentages

How many single units are needed to make one whole unit?

• 10

• 50

• 100

• 1000

What does the set of blocks with ten squares represent?

• One whole unit

• One thousandth

• One tenth

• One hundredth

What is the first step in making a smart estimate?

• Choose numbers that are easy to work with

• Subtract the numbers directly

• Multiply the numbers

• Divide the numbers

What is the smart estimate for 85 hundredths minus 25 hundredths?

• 60 hundredths

• 50 hundredths

• 40 hundredths

• 30 hundredths

How do you represent 85 hundredths using base 10 blocks?

• 8 rods and 5 singles

• 5 rods and 8 singles

• 8 rods and 8 singles

• 5 rods and 5 singles

What is the first step when subtracting 1.54 feet minus 0.15 feet?

• Subtract the hundredths first

• Add the numbers first

• Multiply the numbers first

• Subtract the tenths first

What do you do if you need to subtract more hundredths than you have?

• Subtract the tenths first

• Borrow from the whole units

• Add more hundredths

• Borrow from the tenths

What is the final answer when subtracting 1.54 feet minus 0.15 feet using base 10 blocks?

• 1 whole unit, 4 tenths, and 9 hundredths

• 1 whole unit, 3 tenths, and 9 hundredths

• 1 whole unit, 3 tenths, and 8 hundredths

• 1 whole unit, 2 tenths, and 9 hundredths

What have you learned in this lesson?

• To divide decimals using base 10 blocks

• To add decimals using base 10 blocks

• To subtract decimals using base 10 blocks

• To multiply decimals using base 10 blocks