Q: How many composite numbers that are less than 20?

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3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.

There are 7 composite numbers greater than 20 and less than 30:21, 22, 24, 25, 26, 27, 28

45789

Composite numbers less than 70 and greater than 60 are 62, 63, 64, 65, 66, 68 and 69.

The composite numbers less than 20 are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18

Related questions

There are 15 composite numbers greater than 50 but less than 70

There are 18 that are less than 30.

1260 of them.

74

3 composite numbers, 21, 22, and 24, are greater than 20 but less than 25.

24

Five.

There are 18.

The sum of the composite numbers that are less than 8 is: 4+6 = 10

composite numbers are less than 12: 4, 6, 8, 9, 10

There are 15 prime numbers and 34 composite numbers because 1 is not considered to be a prime or composite number

Of the 1499 numbers less than 1500, number 1 is neither prime nor composite, 239 are primes, and the remaining 1259 are composites.