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1.       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



Edufirst

Answer: ones.

Explanation:

1) The group of the first three digits (those most to the right) of a number belong the period of the ones.

2) The second grup of three digits (tho the left of the first group) belong to the of the thousands.

3) The next group of three digist to the left belong to the period of the millions.

4) The next three form the group of the billions.

5) The other three are the trillions.

6) Therefore, for the given number 751,486, the digits 486 are in the period of the ones, and the digits 721 are in the period of the thousands.

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