Podcast
Questions and Answers
Which number between 1 and 20 is both a perfect square and a power of 2?
Which number between 1 and 20 is both a perfect square and a power of 2?
16
Identify the smallest composite number between 1 and 10.
Identify the smallest composite number between 1 and 10.
6
What is the sum of the first three prime numbers?
What is the sum of the first three prime numbers?
10
Name a composite number between 11 and 20 that is divisible by both 2 and 3.
Name a composite number between 11 and 20 that is divisible by both 2 and 3.
What is the largest prime number below 20?
What is the largest prime number below 20?
Flashcards
1
1
The smallest positive whole number is 1.
2
2
The first prime number is 2; it has only two divisors: 1 and itself.
4
4
Four can be represented as 2 x 2, showing it's a composite number.
9
9
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12
12
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Study Notes
Numbers 1-20
- 1 is the smallest positive whole number.
- 2 is the first prime number.
- 3 is the third natural number.
- 4 can be represented as 2 x 2.
- 5 is a prime number.
- 6 is a composite number (divisible by 2 and 3).
- 7 is the fifth prime number.
- 8 is a power of 2 (2 x 2 x 2).
- 9 is a perfect square (3 x 3).
- 10 can be represented as 2 x 5.
- 11 is the seventh prime number.
- 12 is a composite number (divisible by 2, 3, 4, and 6).
- 13 is a prime number.
- 14 is an even number, divisible by 2 and 7.
- 15 is a composite number (divisible by 3 and 5).
- 16 is a perfect square (4 x 4) and a power of 2.
- 17 is a prime number.
- 18 is a composite number (divisible by 2, 3, 6, 9).
- 19 is a prime number.
- 20 is a composite number (divisible by 2, 4, 5, and 10).
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