To the nearest hundred, 3600
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1,2,3,5,6,10,11,15,22,30,33,55,66,110,121,165,242,330,363,605,726,1210,1815,3630
To estimate the product of 726 and 5, we can round 726 to 700 and multiply it by 5. Multiplying 700 by 5 gives us 3500. Therefore, the estimate for 726 x 5 is 3500.
All even numbers are composite except 2 itself which is a prime number because it has only two factors which are itself and one.
900 would be a fair estimate
You could estimate is as 0.5