Marley won $825 in a contest. His sister won $305. How much did they win altogether?

To find the total amount won by Marley and his sister, we simply add $825 and $305 together: $825 + $305 = $<<825+305=1130>>1130.

Therefore, Marley and his sister won $1130 altogether.

To find the total amount that Marley and his sister won altogether, you need to add their winnings.

Step 1: Add Marley's winnings and his sister's winnings.
$825 + $305 = $1130

Answer: Marley and his sister won a total of $1130 altogether.

To find out how much Marley and his sister won altogether, you can add their individual winnings.

In this case, Marley won $825 and his sister won $305.

To calculate the total amount they won, you simply add these two numbers together:

$825 + $305 = $1130

Therefore, Marley and his sister won a total of $1130 altogether.