There are 756,357,245 birds in the San Antonio Zoo. What is this number rounded to the nearest hundred thousand?

756,400,000.

Step-by-step explanation:

Rounding to the NEAREST hundred thousand in a 9-digit number will always be the first number in the middle. For this, the hundred thousand is 357,245.

When rounding to the nearest hundredth, you look at the tenths. If it is 5 and above, you round up. If it is 4 and below, you round down. In this case, it is 357. The tenth is the 5, so you round up. When you round up, that will cancel out all the numbers behind it. So the 357,245 turns into 400,000.

So your answer is 756,400,000.

Hope this isn't to late and I hope this helps your understanding of rounding!

no, because the sides are not congruent