Answer :

The answer is the thousands period.

Explanation:

Periods of numbers are sets of three digits that are separated by commas when written in standard form.

The period at the right end of a number is the hundreds period; it includes the place values ones, tens, and hundreds.

The period to the left of the hundreds period is the thousands period; it includes the place values thousands, ten-thousands and hundred-thousands.  In this number, 9 is in the hundred-thousands place, 1 is in the ten-thousands place, and 3 is in the thousands place; this puts 913 in the thousands period.

Answer: the thousands period.

Explanation:

1) The complete number is: 913,256.

2) Each group of three digits forms a period.

3) The first group of three digits, 6, 5, and 2 are 6 ones, 5 tens, and 2 hundreds. This group of numbers belong to the ones period.

4) The second group of three digits is 3, 1, and 9, which means: 3 thousands, 1 ten thousands, and 9 hundred thousands. This group is called the thousands period.