Rounding off to thousandths is referring to the hundredth number(3rd number from right)
if it's >5, it +1 to the thousand's number (4th number from right),
eg. 4570 rounded off by thousand = 5000
if <5 then it reduces to 0.
eg. 3489 rounded off by thousand = 3000
for your case, 2,181,465 rounded off to thousand = 2,181,000
Since it’s 3 feet wide that means this is a rectangle, not a square. so Two sides are 3 feet which would equal 6. 16-6=10. The other two sides would have to be 5 so that all the sides add up to 16. The area for a rectangle is Length • Width. so 3•5= 15 feet squared.
