

1.

Use the number line to select the more reasonable estimate for the difference
83
 47.


2.

Use the number line to select the more reasonable estimate for the difference
78
 32.


3.

Use the number line to select the more reasonable estimate for the
difference 64
 27.


4.

Use the number line to select the more reasonable estimate for the difference
91
 44.


5.

Jordan has $27. She spends $16. About how much money does Jordan have
left?
a.  30  10 = 20; Jordan has about $20
left.  b.  20  20 = 0; Jordan has no money left.  c.  20  10 = 10; Jordan has about $10 left.  d.  30  20 = 10; Jordan has about $10 left. 


6.

A box contains 83 linking pieces. KimLi use 52 to build a truck. About how many
blocks are left in the box?
a.  80  60 = 20; about 20 pieces are left in the
box.  b.  90  50 = 40; about 40 pieces are left in the
box.  c.  80  50 = 30; about 30 pieces are left in the
box.  d.  90  60 = 30; about 30 pieces are left in the
box. 


7.

Dina is reading a book with 93 pages. She has read 38 pages. About how many does
she have left to read?
a.  90  40 = 50; Dina has about 50 pages left to
read.  b.  90  30 = 60; Dina has about 60 pages left to
read.  c.  100  40 = 60; Dina has about 60 pages left to
read.  d.  100  30 = 70; Dina has about 70 pages left to
read. 


8.

Charles has sold 28 of the 52 boxes of juice. About how many boxes does he have
left to sell?
a.  50  20 = 30; Charles has about 30 boxes left to
sell.  b.  60  30 = 30; Charles has about 30 boxes left to
sell.  c.  60  20 = 40; Charles has about 40 boxes left to
sell.  d.  50  30 = 20; Charles has about 20 boxes left to
sell. 


9.

A movie is 87 min long. Caitlin has watched 33 min of it. About how much time is
left to the movie?
a.  80  30 = 50; About 50 min are left in the
movie.  b.  90  30 = 60; About 60 min are left in the
movie.  c.  90  40 = 50; About 50 min are left in the
movie.  d.  80  40 = 40; About 40 min are left in the
movie. 
