Rounded to the nearest thousand what number will 4,645 be rounded to?

The thousand place is the 4, so we need to see if the number in the next place rounds the number up or down.  Since it is a 6 (and a 6 rounds up) then it will round up.  Therefore, your final answer is 5,000.

Hope this helps!

√4 + √16 = 2 + 4 = 6   <--- rational
√5 + √36 = √5 + 6   <--- irrational 
√9 + √24 = 3 + √24   <--- irrational
2 * √4 = 2 * 2 = 4   <--- rational 
√49 * √81 = 7 * 9 = 63   <---rational
3√12 = 3√(4 * 3) = (3 * 2)√3 = 6√3    <---irrational

Hope this helps ^-^