Unit 2 Test

Decimal Forms

100

Show the standard form of the decimal: Thirty nine and twenty seven thousandths. 

39.027

200

Write this decimal in word form: 291.19

Two hundred ninety one and nineteen hundredths.

300

Write this decimal in expanded form: 124.041

100+20+4+0.04+0.001=124.041

400

Write this decimal in standard and expanded forms: 

Twenty eight and thirty nine thousandths.

Standard- 28.039

Expanded- 20+8+0.03+0.009

500

Write this decimal in expanded form AND expanded form using powers of ten: 205.25

Expanded- 200+5+0.2+0.05

Expanded Powers of 10-

(2*100)+(5*1)+(2*0.1)+(5*0.01)

Place Value

100

In which place value is the digit 3 in the decimal?

2.983

Thousandths

200

Moving one place value to the left increases the value of a digit by ____.

Ten

300

Select the decimal that shows the digit 7 with a value of 0.007

A- 7,098.8     B- 45.97   C- 3.798   D- 23.017

D- 23.017

400

Select the decimal that shows the digit 2 with a value of 0.2

A- 2.02       B- 2.022       C-2.202      D- 2.01

C- 2.202

500

Select the number in which the digit 8 is TEN TIMES the value of the digit 8 in 7.982. 

A-  58.6       B- 90.876     C-786.48      D-57.184

B- 90.876

Rounding

100

To which place value was the number 3.2 rounded? 

Tenths

200

How many digits should be to the right of the decimal if a number is rounded to the nearest hundredth? 

2

300

Round the decimal 290.786 to the nearest whole number. 

291

400

Round the decimal 1234.5678 to the nearest thousandth. 

1234.568

500

Round this decimal to the nearest hundredth: 

10.996

11.00 or 11

Adding and Subtracting Decimals

100

1.2+2.45=x   

What does x equal?

x=3.65

200

32.67-12.38=x

Solve for x

x=20.29

300

12-9.35=x

What does x equal?

x= 2.65

400

1,002+2.001-- Solve

1,004.001

500

723.412-367.592=x

Solve for x.

x=355.820

Estimating Sums and Differences

100

Estimate the sum of:

3.29+7.96=

Acceptable Answers:

3+8= 11--> Rounded to nearest whole

3.3+8.0=11.3--> Rounded to nearest tenth

200

Estimate the difference of:

4.56-3.67=

Acceptable Answers:

5-4= 1--> Rounded to the nearest whole

4.6-3.7=0.9--> Nearest tenth

300

Estimate: Round to the nearest whole

123.456+15.67+13.2=

123+16+13= 152

400

The car is 6.8 meters long and with a trailer that is 4.72 meters long. What is the total length of both? Use estimation to show why your answer is reasonable. 

11.52 meters long.

6.8 rounds to 7, 4.72 rounds to 5. 7+5=12. 

12 is very close to 11.52, that is how I know my answer is reasonable. 

500

The flight from Grand Rapids to Chicago is 200.48 kilometers. Mr. Ambrose flew to Chicago on Friday and then back to Grand Rapids on Tuesday. How many kilometers did he fly? Explain how you know your answer is reasonable. 

200.48+200.48=

He flew 400.96 km total

I know this is reasonable because...

200.48 is almose 200.5, and 200.5+200.5=401 and 401 is very close to my actual answer of 400.96km.