Math Review-Properties & Adding/Subtracting Decimals

Rounding

100

Round 96.624 to the nearest whole number 

97

200

Round 787.491 to the nearest whole number

787

300

Round 25.94 to the nearest whole number

26

400

Round 1,248.67 to the nearest whole number.

1,249

500

Round 349.52 to the nearest whole number. 

350

Estimate

100

Estimate this problem: 16.07+0.459

16

200

Estimate this problem: 90.01-7.83

82

300

Estimate this problem: 804-76.514

727

400

Estimate this problem: 4.759-3.802

1

500

Estimate this problem: 6.07+4.3

10

Add/Subtract

100

16.07+0.459

16.529

200

6.07+4.3

10.37

300

90.01-7.83

82.18

400

804-76.514

727.486

500

4.759-3.802

0.957

Word Problems

100

If you see the keyword in all what do you do?

Add 

200

If you see the keyword how many more what do you do?

Subtract

300

Sara walked 4.8 miles yesterday, and she walked 3.12 miles today. How many miles did she walk in all? 

4.8+3.12= 

7.92 miles

400

When Jim was born, he weighed 7.8 lbs. His sister Laura weighed 6.9 lbs. How many more pounds did Jim weigh than Laura? 

7.8-6.9=

0.9 lbs

500

Leon went to Menards and bought a tool set for $45.15. He then went to Ace Hardware and bought a weed trimmer for $84.42. Leon had $200 in cash in his wallet. How much money does he have left? 

First 45.15+ 84.42= 129.57

Then 200-129.57=

$70.43

Properties

100

Name that property:

yx=xy

Commutative Property

200

Name that property: 

(84+78)+12=84+(78+12)

Associative Property

300

Using the Associative Property rewrite this expression: 

(4+5)+8

(4+5)+8=4+(5+8)

400

Using the Commutative Property rewrite the expression: 

15x4x18

15x4x18=18x4x15

500

Which property allows you to group different numbers in a problem? 

The Associative Property