Decimal Addition/Subtraction

What is the rule for adding or subtracting decimals?

• Add first

• First, line up the decimals. Then fill in with placeholder zeros. Drop the decimal down. Finally, solve the algorithm.

• Move the decimal to the right the total amount of numbers after the decimal.

• First, add or subtract. Then, move the decimal 2 spaces.

5.4 + 0.5 =

• 4.5

• 4.9

• 5.9

• 5.8

7.2 - 4.3 =

• 2.9

• 3.9

• 3.1

• 2.1

8.4 - 3.1 =

• 5.35

• 5.3

• 5.4

• 4.3

5.6 + 4.2 =

• 9.6

• 9.8

• 9.2

• 1.4

7.1 - 4.4 =

• 2.7

• 3.7

• 3.6

• 2.5

3.3 + 2.22=

• 5.52
• 5.55
• 5.77
• 5.4

7.2 - 4.3=

• 2.9
• 3.9
• 3.1
• 2.1

Aliana bought an apple for $0.89 and a drink for $1.95. What is her total amount of money spent?

• 1.06

• 2.84

• 90.95

• 9.90

Liam bought two sacks of potatoes. The first sack weighed 11.39 lbs. The second sack weighed 14.27 lbs. How many pounds of potatoes does Keegan have in all?

• 2.88 lbs.

• 25.56 lbs.

• 25.66 lbs.

• 256.6 lbs.