Drew wrote the
following sentences: “a period is a group
of any 3 three digits in a number.” do you
agree with drew? if not, how would you
correct him

Every number consists of digits. One digit is the least number of digits a number can have. The place value is the position of each digit in a number. Digits are separated into groups of three by commas. So, a period is a group of three digits, but not any three digits. So, Drew's sentence is false. A period is a group of consecutive digits.