Unit 1 Review

Estimate/Round

100

Round the number to the indicated place value.

3,141; tens

3,140

200

Norwood Park had 423 people before it became a stop on the railroad. Now, there are 767 more people living there. About how many people live in Norwood Park now?

1,200 people

300

Round the number to the indicated place value.

657; hundreds

700

What's that property?

200

Find the missing part. Then identify the property.

9+1 = ____ + 1

9+1 = 9+ 1

commutative

300

Find the missing part. Then identify the property.

(1+2)+3=1+(2+__)

3

Associative

400

Find the missing part. Then identify the property.

0+8=0+_____

8

Identity

500

What property is this? 

(9+8)+7= 9+(8+7)

Associative

Find the Sum/Difference

100

Find the sum. 

71+22=

93

200

Find the difference. 

45-26=

19

300

Find the sum. 

4,121+2,446= 

6,567

Find that Missing Number

200

    2 _ 8

+    1 7

_______

     2 4 5

228

300

     4 _ 8

-      9 7

_______

     3 7 1 

468

400

  344

+_____

   997

653

500

   8 2 5

-         

_________

  5 0 0 

325

Write that form.

100

Write the number in standard form. 

Sixty-one thousand, nine hundred twenty-one

61,921

200

Write the number in expanded form.

one thousand, three hundred seven

1,307

300

Write the number in word form.

30,000+2,000+500+90+4

32,594