Decimals 2.1 - 2.3

Rounding

100

Round to the nearest tens....

28.482

30.0

200

Round to the nearest hundredth....

65.0132

65.01

300

Round to the nearest tenth....

57.79235

57.8

400

Round to the nearest hundred...

7,375.789

7,400.000

500

Round to the nearest thousandth...

68.08792

68.088

Adding Decimals

100

32.87 + 49.78 =

82.65

200

7.03 + 3.82 =

10.85

300

4.72 + 3.988 =

8.708

400

0.444 + 9.1 =

9.544

500

168.23 + 0.1184 =

168.3484

Subtracting Decimals

100

23.7 - 0.2 =

23.5

200

3.97 - 2.04 = 

1.93

300

14.0 - 2.3 =

11.7

400

388.22 - 29.11 =

359.11

500

202.89 - 101.944 =

100.946

Money Problems

100

Jimmy bought one apple for $0.49 and one banana for $0.38. How much did he spend in total?

$0.49 + $0.38 =

$0.87

200

Joanne bought three books that cost $3.95, $4.99, and $6.05. How much did she spend in all? Use compensation and mental math to find the sum.

$3.95 + $4.99 + $6.05 =

$14.99 was spent in all

300

Gregg bought two t-shirts for $5.99

Sam bought three t-shirts for $2.95

Who got the better deal?

Gregg- $5.99 + $5.99 = $11.98

Sam- $2.95 + $2.95 + $2.95 = $8.85

Sam got the better deal

400

For a family picnic, Mr. Santos spent $12.30 for hot dogs and $5.02 for buns. How much more did he spend for the hot dogs than for the buns? Explain how you used mental math to determine the difference.  

$12.30 - $5.02 =

Mr. Santos spent $7.28 more for the buns.

500

Jane ordered a new pair of shoes for $87.65

Ben ordered two new pair of shoes, one for $32.33 and one for $57.89

Who got the better deal?

What is the difference between their totals?

Jane- $87.65

Ben- $32.33 + $52.89 =  $ 85.22

$87.65 - $85.22 = $2.43

Sam got the better deal and saved $2.43

Bonus

100

234.145 + 345.88= 

Round your answer to the nearest tenth...

Total 580.025

850.0

200

64.87 - 12.986 =

Round your answer to the nearest hundredth

51.884

Rounded to the nearest hundredth is 51.88

300

40,668.089 - 4,325.2345 =

Round to the nearest tenth

36,342.8545

Rounded to the nearest tenth is 

36,342.9

400

Alex spent $31.50 on his sister's lunch and spent $19.99 on his own lunch. How much did he spend on lunch in total? Round to the nearest tenth..

$31.50 + $19.99= $51.49

Alex spent $51.50 in total

500

Eduardo buys a sandwich and a drink. Use mental math to find the amount of change he gets from $10.00.

ITEM                       PRICE

Pot Pie                     $6.75

Sandwich                 $4.99

Chicken Wrap            $4.19

Drink                       $0.98

$4.99 + $0.98 =   $5.97

$10.00 - $5.97 =

Eduardo has the change of $4.03