Factors of 10
The factors of 10 are 1, 2, 5, 10. No, 10 is a composite number. Its prime factorization is 2 × 5.
Factor pairs of 10
Every factor has a partner that multiplies with it to give 10. Listing pairs from the outside in is the fastest way to find all the factors: once the two numbers in a pair meet in the middle, you have them all.
| Pair | Check |
|---|---|
| 1 and 10 | 1 × 10 = 10 |
| 2 and 5 | 2 × 5 = 10 |
Prime factorization of 10, step by step
Divide by the smallest prime that goes in evenly, then repeat on the result until you reach 1. The divisors you used are the prime factors.
| Step | Divide | Result |
|---|---|---|
| 1 | 10 ÷ 2 | 5 |
| 2 | 5 ÷ 5 | 1 |
So 10 = 2 × 5, written compactly as 2 × 5.
Divisibility checks for 10
The quick rules a student uses before dividing, applied to 10:
| Divisible by | Rule | For 10 | Result |
|---|---|---|---|
| 2 | last digit is even | last digit 0 | yes |
| 3 | digit sum divisible by 3 | digits add to 1 | no |
| 4 | last two digits divisible by 4 | 10 ÷ 4 | no |
| 5 | last digit is 0 or 5 | last digit 0 | yes |
| 6 | divisible by both 2 and 3 | even, digit sum 1 | no |
| 8 | last three digits divisible by 8 | 10 ÷ 8 | no |
| 9 | digit sum divisible by 9 | digits add to 1 | no |
| 10 | last digit is 0 | last digit 0 | yes |
Frequently Asked Questions
What are the factors of 10?
The factors of 10 are 1, 2, 5, 10.
Is 10 a prime number?
No, 10 is a composite number. Its prime factorization is 2 × 5.
How many factors does 10 have?
10 has 4 factors. You can get that count from the prime factorization without listing them: add 1 to each exponent in 2 × 5 and multiply -- (1+1) × (1+1) = 4.
Is 10 even or odd?
10 is even (2 is one of its factors).
What is the sum of the factors of 10?
1 + 2 + 5 + 10 = 18. Leaving out 10 itself, the proper factors add to 8, less than 10, so 10 is a deficient number.
More Number Theory
- Factor Calculator (look up any number)
- GCF Calculator
- LCM Calculator
- LCD Calculator