What is the greatest common factor (GCF) of 79 and 51?
Difficulty: Medium
About this MCQ
Medium ACT item. Correct choice: C. 1.
- A. 4029
Why not A: “4029” is not 1.
- B. 130
Why not B: “130” is not 1.
- C. 1 ✓
- D. 2
Why not D: “2” is not 1.
Correct answer
C. 1
Explanation
1 is the value that answers “What is the greatest common factor (GCF) of 79 and 51” (option C). Option A (4029) is a different value from 1. Option B (130) is a different value from 1. Option D (2) is a different value from 1. Keep 1 as the ACT fact for this stem.
Source: Original practice question, MCQsHub
Tags: American Exams, ACT, Quant, Number Properties
Submitted by: MCQsHub Editorial