Martha read 120 pages in her book, which has a total of 200 pages. Which fraction best represents the portion of the book that she has not read?
120/200 = 12/20 = 3/5
To find the fraction that represents the portion of the book that Martha has not read, you need to subtract the number of pages Martha read from the total number of pages in the book, and then express this value as a fraction.
Step 1: Subtract the number of pages Martha read from the total number of pages in the book.
200 - 120 = 80
Step 2: Express the remaining number of pages (80) as a fraction of the total number of pages (200).
The fraction that represents the portion of the book that Martha has not read is 80/200.
However, this fraction can be simplified. Both the numerator (80) and the denominator (200) are divisible by 40. Divide both numbers by 40 to simplify the fraction.
80 ÷ 40 = 2
200 ÷ 40 = 5
The simplified fraction that represents the portion of the book that Martha has not read is 2/5.