Decimal Review

Place Value

100

Move the 5 so it is 10 times the value it is in this number:

437.952

437.592

200

What number shows the 9 as 1/10 the value it is in this number:

459.83

458.93

300

Which numbers is the digit 4 have the value of 0.4?

a) 4,227.197     b) 3,564.210

c) 235.48          d) 3.441

e) 140.344        f) 65,327.493               

c, d, f

400

Write this number in expanded form--681.045

600+80+1+0.04+0.005

500

Write this number in expanded form with place value:

94.326

(9x10)+(4x1)+(3x1/10)+(2x1/100)+(6x1/1000)

Rounding

100

Round this number to the nearest tenth:

45.62

45.6

200

Round this number to the nearest hundredth:

468.038

468.04

300

Round this number to the nearest ten:

648.17

650

400

Is this number rounded correctly to the nearest ones?

456.07 = 450

No--should be 456

500

Is this number rounded correctly to the nearest tenth?

56.281=56.3

Yes!

Add or Subtract

100

 356.34 

+ 67.29

423.63

200

   4,286.05

-     319.28

3,966.77

300

Mike measured the snowfall over a 3-day period in November.  It snowed 0.34 inches one day, 0.75 inches the next day, and 0.5 inches the third day.  How much snow fell over all 3 days?

(0.34 + 0.75 + 0.5)  1.59

400

I bought pizza for the class, a cheese pizza for $5.55 and a meaty pizza for $8.95 (no tax).  I had a coupon for $2.25 off my order.  How much change did I get back if I paid with a $50 bill?

($5.55 + $8.95=$14.50)

($14.50 - $2.25=$12.25)

($50.00 - $12.25=$37.75)

500

I ran 257.24 feet chasing Hannah's cow around the barn.  We ran around the barn twice!  How far did I chase Hannah's cow?  

(257.24 + 257.24)

514.48 ft.

Comparing Decimals

100

Show correct sign to compare:

34.56 ___ 34.78

less than <

200

Show the correct sign to compare:

0.32 ___ 0.23

Greater than >

300

Show the correct sign to compare:

1.420 ___ 1.042

Greater than >

400

Show the correct sign to compare:

0.6 ___ 0.60

Equal =

500

Show the correct sign to compare:

256.01 ___ 256.10

Less than <

Bonus

100

Use the associative property to add.

9.6 + 3.21 + 4.4 =

9.6 + 4.4= (9+4=13) & (.6+.4=1) so 13+1=14

14+3.21=17.21

200

Use the Associative Property to add.

7.55 + (3.45 + 8.17)

Regroup to add 7.55 + 3.45= (7+3=10) and (.55+.45=1) so 10+1=11.  Then 11+8.17=19.17

300

True or false--you can not add the numbers in any order that makes sense to you.

False

400

Which number is the value of the 7 greater?

37.31   0.75

37.31

500

Estimate the sum.

  $32.27

+$24.79

$32.27 rounds to $32

$24.79 rounds $25

$32 + $25=$57