1. <span>The name of period that has 486 in the given number which is 751 486 is hundreds. period is considered to a group of places of the digits, like the given number 486 is the group of hundred because the highest number it contains is 400. => 400 + 80 + 6 => 4 hundreds + 8 tens + 6 ones => 486 while 751 is the period of hundred thousands. => 700 000 + 50 000 + 1 000 => 751 000