Addition and Subtraction of Decimals with 4-5 Digits

What is very important when you add decimals?

• just add them

• make sure the addends have the same place values

• line up the decimal point

What is the first step to add the decimals. 3.5 + 5.44?

• ADD the numbers

• FILL extra zeros so the numbers have the same length.

• PUT the decimal point in the answer in line with other decimal points.

• LINE UP the decimal points vertically

What is the last step when you are adding or subtracting decimals?

• Line them up

• Drag the point

• Move the decimal point to the end.

145.7 + 56.78 

Mathematical Equivalence

ON

Find the sum of 148.093 + 5.675

• 153.768

• 153.668

• 152.668

• 153.786

62.573 + 4.328

Mathematical Equivalence

OFF

In 2018 the tree grew 10.27 inches. In 2019, it grew another 8.4 inches.

How many inches did the tree grow over the two years?

• 11.11 inches

• 18.67 inches

• 18.31 inches

• 94.27 inches

What is the first step to adding and subtracting decimals?

• Line up the decimals.

• Add zeros.

• Start adding.

• Start subtracting.

What is the second step in adding or subtracting decimals?

• Set up the problem vertically and line up the decimals

• Insert placeholder zeros if needed

• Add or subtract the numbers

• Bring the decimals straight down

How do you solve problems that involve adding decimals?

• if the decimal is in the house, raise it to the roof

• Bring UP the decimal point

• Line up the decimals

• Completely ignore the decimal