Factors of 155
The factors of 155 are the whole numbers that divide 155 exactly, leaving no remainder. These numbers always come in pairs, like (1, 155) or (-1, -155), and both positive and negative factors are possible. Factors are always integers, not fractions or decimals. You can find them through simple division or prime factorization. Understanding the factors of 155 builds a strong base in number theory and helps in learning divisibility, multiples, and prime numbers. In this article, we’ll explore all positive factors, factor pairs, and the prime factorization of 155with examples to make it easy to follow.
What are the Factors of 155?
The factors of 155 are the whole numbers that divide it exactly without leaving a remainder. These numbers are 1, 5, 31 and 155. When we include negative values, the complete set becomes -1, -5, -31 and -155. Each of these numbers can multiply with another to give 155. In mathematics, factors help us understand how a number is built, whether it’s made up of smaller numbers or stands alone as a prime. 155 can be divided by other numbers besides 1 and itself, so it’s considered a composite number.
Factors of 155: 1, 5, 31 and 155
Factor Pairs of 155
The factor pairs of 155 are combinations of two integers that multiply together to give exactly 155. Each pair shows how 155 can be expressed as a product of two whole numbers. The positive factor pairs are (1, 155), (5, 31), while the negative pairs are (-1, -155), (-5, -31). Learning these helps build a strong foundation in multiplication and division, and also supports understanding key concepts like the greatest common factor and prime factorization. You can also explore how factor pairs relate to the greatest common factor and prime factorization for deeper understanding.
Positive Factor Pairs of 155:
| Factor 1 | Factor 2 |
|---|---|
| 1 | 155 |
| 5 | 31 |
Negative Factor Pairs of 155:
| Factor 1 | Factor 2 |
|---|---|
| -1 | -155 |
| -5 | -31 |
Prime Factorization of 155
Prime factorization of 155 is the process of expressing it as a product of its prime numbers. When we repeatedly divide 155 by the smallest possible prime numbers, we get 5, 31. Therefore, the prime factorization of 155 is 5 × 31. Knowing prime factors is essential for solving problems involving GCF, LCM, and simplifying fractions.
Prime factors of 155:
5, 31
Prime factorization of 155:
5 × 31
Compact form:
5 × 31
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How to Find the Factors of 155?
Finding the factors of 155 can be done efficiently using the division method. You only need to check numbers up to the square root of 155, because each divisor below the square root has a matching pair above it. Each number that divides 155 evenly forms a factor pair, giving you both the divisor and its corresponding factor. This method saves time and helps understand the structure of 155 in terms of its building blocks.
Optimized steps to find factors of 155:
- •155 ÷ 1 = 155 → ✅ Factor Pair: (1, 155)
- •155 ÷ 5 = 31 → ✅ Factor Pair: (5, 31)
This method avoids unnecessary checks and quickly identifies all factor pairs, making it especially helpful for larger numbers.
Find factors and factor pairs of any number with our Factor Checker tool.
Frequently Asked Questions about factors of 155
What are the factors of 155?
The factors of 155 are 1, 5, 31, 155.
What is the prime factorization of 155?
The prime factorization of 155 is 5 × 31.
How do I find the factors of 155?
To find the factors of 155, start by dividing 155 by every number from 1 up to the square root of 155.
What are factor pairs of 155?
The factor pairs of 155 are (1, 155), (-1, -155), (5, 31), (-5, -31).
How can I use the factors of 155?
The factors of 155 can be used to simplify fractions, find the greatest common divisor (GCD), and determine multiples.
Are the factors of 155 always positive?
Factors can be both positive and negative. For example, the negative factors of 155 are -1, -5, -31, -155.