+ - x ÷ Decimal Review

Place Value

100

In 9.81, what place is the 1 in?

Hundredths 

200

In 1.203 what place is 3 in?

thousandths

300

In 28.465, what place is the 5 in?

Thousandths 

400

What is 16.43 - 2.9 rounded to the nearest whole number? 

Exact answer is 13.53, rounded to the nearest whole number is 14.

500

What is the value of 12.86 x 4.5 rounded to the nearest whole number?  

 Exact = 57.87, so rounded to the nearest whole number is 58.

Saying/Writing Decimals

100

Say the following decimal:

46.6

Forty six and six tenths

200

Write the following decimal:

twenty-two and three hundredths

22.03

300

Write in words the following decimal:

15.879

Fifteen and eight hundred seventy nine thousandths

400

Write in words the following decimal:

9.099

Nine and ninety nine thousandths

500

Write the following decimal:

Fifty-three and twenty one ten thousandths

53.0021

+ and - Decimals

100

Add these decimals. 21.74 + 8.27

30.01

200

Subtract these decimals. 17 - 9.43

7.57

300

Complete (6.125 + 18) - 17.4

(24.125) - 17.4 = 6.725

400

In a week, you work 1.4 hours on math homework, and 2.05 hours on ELA homework.  Your science homework takes .75 hours less than your math homework.  How long did you work on homework this week? 

(1.4 - 0.75) + 1.4 + 2.05 = 

.65 + 1.4 + 2.05 = 4.1 hours  

500

A triangular play area has one side that is 4.35ft long.  The 2nd side is twice as long as the first, and the 3rd side is 3.25ft longer than the 2nd.  How many inches is the perimeter? 

4.35 + (4.35 + 4.35) + (4.35 + 4.35 + 3.25) = 

25 ft = 300in

Multiplying Decimals

100

Multiply these decimals. 0.03 x 100

3

200

Multiply these decimals. 7 x 2.6 

18.2

300

Multiply these decimals. 0.23 x 7.4

1.702

400

How many thousandths are in 3 ones? 

3,000

500

A bamboo plant grows about 1.25m per day.  Find the growth (in cm) over the course of a week.  

1.25 x 7 = 8.75m 

875cm

Mixed Numbers

100

5 5/7  as an improper fraction

40/7

200

Define and provide an example of an improper fraction

A fraction where the numerator is larger than the denominator.   Ex: 12/5. 

300

14 2/3 x 6 9/10

101 1/5

400

3/4 ÷ 18

1/24

500

3/5 x 7/12 ÷ 2 7/10

7/54

Dividing Decimals

100

Divide.

23.87-:7

3.41

200

Divide.

60-:0.5

120

300

Divide.

0.52 ÷ 0.004

520 ÷ 4

130

400

95.04 ÷ 0.0132

950400 ÷ 132

7200

500

Your dad has 420 hours of work on the engine in his truck.  Each trip he took in the truck averaged 3.5 minutes.  How many trips did he take?  

420 x 60= 25,200

25,200 ÷ 3.5 = 7200 trips