Adding Decimals
Subtracting Decimals
Rounding Decimals
Word Problems
Original/Rounded Number
100
3.29 + 7.6 =
10.89
100
26.48 - 6.25 =
20.23
100

Round 6.387 to the hundredths place

6.39

100
Fred swam 12.5 laps on Tuesday, but he only swam 7.8 laps on Wednesday. How many less laps did he swim on Wednesday? 

What is 4.7 laps? 

100

The original number is 4.56. What can we round this number to? 

What is 4.6 and/or 5? 

200
6.7 + 42.9 =
49.6
200
76.48 - 24.64 =
51.84
200
Round 168.84 to the whole number
169
200

Sam walks 0.48 miles in the morning and 1.57 miles in the afternoon. How many miles does she walk altogether? 

What is 2.05 miles?

200

The original number is 7.998, what can we round this whole number to? 

What is 8? 

300
78.29 + 6.75 =
86.04
300
65.4 - 22.6 =
42.8
300

Round 287.15 to the tenths place

What is 287.2

300

Mark has $10 to go to the store. He buys $2.20 worth of fruit and $7.65 worth of veggies at the grocery store. How much change will he receive back? 

What is $0.15 (cents) 

300

The rounded number is 2.4, what could the original number be? 

What is 2.41, 2.42, 2.43, 2.44 

OR 2.35, 2.36, 2.37, 2.38, 2.39

400
106.348 + 32.4 =
138.748
400
68.4 - 13.298 =
55.102
400

If the number to the right of which you are rounding is 5 or greater, you do this to the number you are rounding.

What is rounding up?

400

Joe goes to the movie theater and purchases two tickets. Tickets are $5.75 each. How much does he spend in all?

What is $11.50?

400

What is the original number if the rounded number is 25.89?

What is 25.891, 25.892, 25.893, 25.894, OR
25.885, 25.886, 25.887, 25.888, 25.889

500
When adding together decimals, you need to line these up.
What are the decimals?
500

5903.24-3602.1

What is 2301.14

500

If the number to the right of the number you are rounding to is 4 or less, you do this.

What is let the number rest or drop off the numbers to the right of the rounding number?

500

Sally and Mike go shopping. They EACH have $25. Sally spends $8.92 on food and $11.54 on a toy. Mike spends $7.78 on food and $12.96 on a toy. Who receives MORE change back? 

What is Sally? 

500

9.875 is my original number. What can I round my number to be? List all the options. 

What is 10, 9.9, 9.89, 9.88?