It is 644 because .4 is less than .5
600
644
Oh honey, it's simple math. 644, huh? Well, to round that bad boy to the nearest ten, you just look at the digit in the tens place. Since it's a 4, which is less than 5, you keep the 4 in the tens place and change the rest to zero. So, 644 rounded to the nearest ten is 640. Easy peasy lemon squeezy.
100
That is 4800
4198 to the nearest 100 = 4200
It is 644 because .4 is less than .5
100
100
100
853 rounded to the nearest 100: 900. 10853 rounded to the nearest 100: 10900.