Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Estimating 4 digits

Estimating sums and differences with 4 digit numbers

Mrs. Franks asked community members to donate school supplies to Harrison. They donated 3,942 pencils and 2,934 notebooks. About how many more pencils, to the nearest hundreds, were donated than notebooks? About 1,000 more pencils were donated than notebooks.
The Hershey’s Factory made 2,035 chocolate bars on Monday and 4,823 bars on Tuesday. To the nearest thousand, about how many chocolate bars did the factory make in all those two days? The factory made about 7,000 chocolate bars in all.
Mr. Hale is trying to estimate how much black and green construction paper he has. He has 6,382 pieces of black paper and 9,824 pieces of green. About how many pieces of green does he have than black? There are about 4,000 more pieces of green paper than black.
Janelle bought a bag of beads. There are 2,353 red beads and 3,804 blue beads in the bag. To the nearest thousand, about how many beads are there in all? There are about 4,000 beads in all.
Ms. Gilberts observes a field to determine how many tulips and daises there are. She counts 9,242 tulips and 5,853 daises. Determine about how many more tulips there are than daises. There are about 3,000 more tulips than daises in the field.
Scientists tracked a humpback whale for 2 months.. The whale swam 2,398 miles the 1st month and 4,875 miles the next. About how many more miles, to the nearest hundred, did the whale swim the 2nd month than the 1st? The whale swam about 2,500 more miles the second month.
Created by: HarrTeacher