Common Factors and Multiples
Grade 4 · Math · Factors and Multiples · New Hampshire, USA
Lesson Summary
Common factors are factors shared by two numbers. Common multiples are multiples shared by two numbers.
Explanation
The factors of 12 are 1, 2, 3, 4, 6, and 12. The factors of 18 are 1, 2, 3, 6, 9, and 18. The common factors are 1, 2, 3, and 6 because they appear in both lists. The greatest common factor (GCF) is 6. Common multiples work the same way. The multiples of 3 include 3, 6, 9, 12, 15 and the multiples of 4 include 4, 8, 12, 16, 20. The smallest number that appears in both lists is 12, so 12 is the least common multiple (LCM).
Practice Questions
Q1: What is the greatest common factor of 8 and 12?
Answer: 4
Q2: What is the least common multiple of 6 and 8?
Answer: 24
Q3: List all common factors of 20 and 30.
Answer: 1, 2, 5, 10
People Also Ask
What is Common Factors and Multiples in Grade 4 Math?+
Common Factors and Multiples is a lesson in the Factors and Multiples chapter of Grade 4 Math. It is part of the New Hampshire, USA school curriculum and covers key concepts that students need to understand at this level.
What grade level covers Common Factors and Multiples?+
Common Factors and Multiples is taught in Grade 4 as part of the Math curriculum in New Hampshire, USA.
How can I help my child with Factors and Multiples in Math?+
Start with the lesson summary and explanation on this page. Practice the questions provided, then use TutorTom for personalized, step-by-step help with Factors and Multiples topics.