Unit 2 Addition, Subtraction, Rounding Word Problems

Third graders collected socks to donate for a sock drive.

The first week, they collected 7 socks

The second week, they collected 9 socks

They threw away 4 socks because they had holes

Which number sentence can be used to find the number of socks the third graders were able to donate?

• 9 + 7 + 4 = ?

• 9 - 7 - 4 = ?

• 7 + 4 + 9 = ?

• 7 - 4 + 9 = ?

Third graders bought books at the book fair.

The first day, they bought 10 books

The second day, they bought 5 books

They threw away 2 books because they got moldy

Which number sentence can be used to find the number of books the third graders had left?

• 5 + 2 + 10 = ?

• 5 - 2 + 10 = ?

• 10 - 5 + 2 = ?

• 10 - 5 - 2 = ?

Third graders made bookmarks to donate to the library

The first week, they made 30 bookmarks

The second week, they made 19 bookmarks

They threw away 10 bookmarks because they ripped

Which number sentence can be used to find the number of bookmarks the third graders were able to donate?

• 30 - 19 + 10 = **

• 19 - 10 + 30 = **

• 19 + 10 + 30 = **

• 30 - 19 - 10 = **

Third graders collected dog food for the pet shelter

The first week, they collected 519 bags of dog food

The second week, they collected 388 bags of dog food

They threw away 43 bags because they ripped open

Which number sentence can be used to find the number of dog food bags the third graders were able to donate?

• 388 + 519 + 43 = <>

• 519 - 388 - 43 = <>

• 519 - 388 + 43 = <>

• 388 - 43 + 519 = <>

The blue dot on the number line represents the number of pounds of peanuts an elephant eats in a day. About how many pounds of peanuts did the elephant eat?

• About 7,000 pounds because the blue dot is more than halfway between 4,000 and 7,000

• About 6,000 pounds because the blue dot is more than halfway between 5,000 and 6,000

• About 4,000 pounds because the blue dot is more than halfway between 4,000 and 6,000

• About 5,000 pounds because the blue dot is less than halfway between 5,000 and 6,000

If a number is MORE than halfway between two numbers you round...

• UP

• DOWN

If a number is LESS than halfway between two numbers you round....

• UP

• DOWN

Round these numbers to the nearest hundred and add to find the sum:

93

121

288

• 300

• 400

• 500

• 600

The purple dot on the number line represents the number of pounds of pumpkins children picked at the fall festival.

About how many pounds of pumpkins were picked during the fall festival?

• About 4,000 pounds were picked, because the purple dot is less than halfway between 4,000 and 8,000

• About 6,000 pounds were picked, because the purple dot is less than halfway between 4,000 and 9,000

• About 8,000 pounds were picked, because the purple dot is more than halfway between 7,000 and 8,000

• About 7,000 pounds were picked, because the purple dot is less than halfway between 7,000 and 8,000

The Waco zoo recently added seals to their exhibit. There are now 10 male seals and 16 female seals. What is the difference between the number of female seals compared to the number of male seals?

• The difference between the number of female seals compared to the number of male seals is 5

• The difference between the number of female seals compared to the number of male seals is 6

• The difference between the number of female seals compared to the number of male seals is 10

• The difference between the number of female seals compared to the number of male seals is 3