Well just think, what is the ten thousands place? 1 right by 6. From this to round you look at the previous number 6, anything 5 or above will be rounded up making the 1 into a 2, anything lower than a 5 will become rounded down making the 1 stay the same, but instead making it into 10,000 So the answer would be 20,000
When rounding off the rule is you round off to the nearest 5. 17.2 would then be rounded of to 17. should it have been 17.5 you would then round up to the next 5 which would be 18
