Rounding/Estimating
Add Decimals
Subtract Decimals
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Word Problems
100

Round this decimal to the nearest WHOLE number. 

2.6


3

100

   Add

8.7 + 3.7 =


12.4

100

Subtract

6.9 - 5.1 =


1.8

100

What is the value of the 6 in 2464?


The value of the 6 is 60

100

Mike has two pencils that he sharpened many times.  One pencil is 4.8 inches long, and the other pencil is 3.25 inches long.  How much longer is the first pencil that the second pencil?


1.55 inches

200

Round this number to the nearest tenths. 

26.31



26.3

200

 Add

7.1 + 5.6=

12.7

200

Subtract

6.92 - 5.13 =


1.79

200

34 + 18 =


34 + 18 = 52.

200

The fruit stand sold:

25.5 lbs. of apples,

16.25 lbs. of pears, and

17.373 lbs of oranges. 

How many pounds of fruit did they sell altogether?



59.123

300

ESTIMATE the sum.

358 + 293=


700

300

 Add

2.09 +  9.18=


11.27

300

Subtract

89.3 - 4.9 =


84.4

300

What is the sum of 340 + 104?


340 + 104 = 444

300

Sara bought a hot dog for $2.50 and a soda for $1.25 at the county fair.  She paid with a $10.00 bill.  How much change did she get back?


$6.25

400

ESTIMATE THE SUM.

15.01  -  4.4 =



11

400

Add

7.91 + 8.43 =


16.34

400

Subtract

23.69 - 12.22


11.47

400

My little brother collects a variety of rocks. On Monday he found 105 tiny blue pebbles. On Tuesday he found 97 small quarts rocks. How many total rocks did my brother find?

105 + 97 = 202 rocks

400

My family and I went on a long road trip last weekend. On Saturday we drove 194 miles. On Sunday we drove 186 miles. How far did we drive last weekend?

194 + 186 = 380 miles

500

Estimate the difference.

22.4  -  16.2  =


5

500

  Add

5.05 + 0.22 + 17.41 =


22.68

500

Subtract

1.67 - 0.97


0.7

500

John has 235 basketball cards, 302 baseball cards, and 109 football cards. How many total cards does John have?


235 + 302 + 109 = 646 total cards.

500

My brother and I both love to play with Legos. We decided to combine our legos so we could build something really big. If my brother had 755 and I had 708. About how many legos do we have to work with now?(Round)


800 = 700 = 1500 legos