What is the nearest multiple of 10 to 634?

The nearest multiple of 10 to 634 is 630. To find the nearest multiple of 10, you need to determine the distance between the number and the nearest multiples of 10. In this case, the distance between 634 and 630 is 4, which is smaller than the distance to 640. Therefore, 630 is the nearest multiple of 10 to 634.