How would you round 509 to the nearest ten?

Answer 1

Count in tens. What are the two tens either side of 509?

500 is smaller and 510 is bigger.

Any ten smaller than 500 is going to be further away than 500

Any ten bigger than 510 is going to be further away than 510

So the answer is going to be one of 500 and 510.

Now,

how far is 500? 509 - 500 = 9 units

how far is 510? 510 - 509 = 1 unit

So which is the smaller distance? 1 unit to 510. So 510 is the nearest 10.

Answer 2

510