What is the estimate of the sum of 324, 653, 303, and 491 using front end estimation?

I think your answer is 1,800
The sum of these numbers is 1771, so if you round up or down, whichever is closest, then you would get a total of 1,800. 
I hope this helps!

1. 300
2. 700
3. 300
4. 500

300 + 700 + 300 + 500 = 1,800
Hope this helps!

Answer 20 centimeters15+8=2323-3=20so the answer is 20 centimeters