Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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
Know
remaining cards
Save
0:01
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:
Retries:
restart all cards
share
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

Prime/Composite

These cards have FOUR sides, flip thru them all!

QuestionAnswer
21 21 : odd, not divisible by 2 2+1=3 : Is divisible by 3 COMPOSITE COMPOSITE
0 NEITHER prime or composite NEITHER NEITHER NEITHER
8 8 : even, divisible by 2 COMPOSITE COMPOSITE COMPOSITE
9 9 : odd, not divisible by 2 9 : divisible by 3 COMPOSITE COMPOSITE
15 15 : odd, not divisible by 2 15 : 1+5=6 , divisible by 3 15 : ends in 5, divisible by 5 COMPOSITE
17 17 : odd, not divisible by 2 17 : 1+7=8 , not divisible by 3 17 : doesn't end in 0 or 5, not divisible by 5 PRIME
39 39 : odd, not divisible by 2 39 : 3+9=15 , divisible by 3 COMPOSITE COMPOSITE
41 41 : odd, not divisible by 2 41 : 4+1=5 , not divisible by 3 41 : doesn't end in 0 or 5, not divisible by 5 PRIME
45 45 : odd, not divisible by 2 45 : 4+5=9 , divisible by 3 45 : ends in 5, divisible by 5 COMPOSITE
51 51 : odd, not divisible by 2 51 : 5+1=6 , divisible by 3 COMPOSITE COMPOSITE
57 57 : odd, not divisible by 2 57 : 5+7=12 , divisible by 3 COMPOSITE COMPOSITE
62 62 : even, divisible by 2 COMPOSITE COMPOSITE COMPOSITE
67 67 : odd, not divisible by 2 67 : 6+7=13 , not divisible by 3 67 : doesn't end in 0 or 5, not divisible by 5 PRIME
93 93 : odd, not divisible by 2 93 : 9+3=12 , divisible by 3 COMPOSITE COMPOSITE
7 7 : odd, not divisible by 2 7 : not divisible by 3 7 : not divisible by 5 PRIME
11 11 : odd, not divisible by 2 11 : 1+1= 2 : not divisible by 3 11 : not divisible by 5 PRIME
1 NEITHER prime or composite NEITHER NEITHER NEITHER
Created by: PRO Teacher lit123