Five ten-thousandths looks like this: 0.0005
All of these are less:
0.0004
0.0003
0.0002
0.0001
0.00001
0.000001
.
.
etc.
Answer:
The answer is 45600 as 621 is less than 650 and should be rounded down.
A minus before a parenthesis means we need to change the sign.
So 2 + 8 - 3 = 7