Topic 2: Adding and Subtracting Decimals Review

The _________ lets you add two decimals in any order.

Example: 11.45+3.39=3.39+11.45

Answer explanation

commutative property

_____are decimal numbers that have the same value.

For example, 0.5 and 0.50 are _______.

Answer explanation

Equivalent decimals

You can replace the values in a problem with _____

so it is easier to use mental math.

Answer explanation

Compensation

When you adjust one number and change another number in a problem to make it easier.

Answer explanation

compatible numbers

The __________ lets you change the grouping of the numbers.

Example: (11.45+3.39)+9.55 =11.45+(3.39+9.55)

Answer explanation

associative property

Jim earns $22.50, $14.75, and $8.50 on different days. How much did he earn in all?

Which problem could be represented using this bar diagram?

• Mrs. Beck has $250. She got $182 for her birthday. What is the total amount of money Mrs. Beck has now?

• Mrs. Ripke is driving 250 miles to see her brother. She has driven 182 miles so far. How much farther does she have to drive?

• Mr. Walker paid $250 for a new bike. He also paid $182 for accessories for his bike. What is the total amount Mr. Walker paid?

• Mrs. Jeffries' class collected 250 pounds of pop tabs in January. They collected 182 pounds of pop tabs in February. How many pounds of pop tabs did they collect in all?

Mr. Beck is training for a race. He biked 15.62 miles one day and 19.8 miles the next day. How much farther did he run the second day than the first day?

• 4.22 miles

• 17.6 miles

• 13.64 miles

• 4.18 miles

Mr. Beck is training for a race. He biked 15.62 miles one day and 19.8 miles the next day. What is his combined distance for both days?

• 35.42 miles

• 17.6 miles

• 13.64 miles

• 4.18 miles

Which equation matches the model?

• 0.73 - 0.23 = 0.50
• 0.50 + 0.23 = 0.73
• 0.73 + 0.23 = 0.50
• 0.73 - 0.50 = 0.23