[PDF] Wednesday: To identify prime numbers and composite numbers

Paper III - Prime-Numberspl

Paper III: What do we know about prime numbers distribution? number, or 31 is a composite number divisible by a prime number greater than 5

[PDF] 31 Thirty-One XXXI

The number 31 appears in only one Pythagorean triple [31, 480, 481], which is primitive, of course As a sum of three odd primes: 31 = 3 + 5 + 23 = 3 + 11 + 17

[PDF] MATHEMATICS Topic: Playing With Numbers - Class Notes

26 jui 2020 · It is prime number (j) The product of any two even numbers is always even True; 3 The numbers 13 and 31 are prime numbers

[PDF] Prime and Composite Numbers

PRIME NUMBER: A whole number that has only two factors, one and itself Example: 7 is considered prime because the only factors that will equal 7 is 1 x 7

[PDF] Prime Numbers and Factorisation - University College Dublin

22 jan 2022 · A proper factor is a factor of n not equal to 1 or itself A prime number is an integer p ? 2 whose only factors are 1 and itself Equivalently

Calculus and Prime Numbers

The sequence of primes 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47, is mysterious, haphazard, and important What can we say about them, and do techniques

[PDF] Structure and randomness in the prime numbers - UCLA Mathematics

17 jan 2007 · A prime number is a natural number larger than 1 which cannot be expressed as the product of two smaller natural numbers 2,3,5,7,11,13,17,19,23

[PDF] Wednesday: To identify prime numbers and composite numbers

A prime number is a number which is divisible by only two different numbers: itself and by one The first four prime numbers are 2, 3, 5 and 7

A Prime Numbers - Springer

A number greater than 1 is prime if its only positive divisors are 1 and it- self; otherwise it's composite Primes have interested mathematicians at least

149982_6Wednesday_Prime_numbers_incl_Challenge_and_Answers.pdf Wednesday: To identify prime numbers and composite numbers.

Including Challenge

A prime number is a number which is divisible by only two different numbers: itself and by one. The first four prime numbers are 2, 3, 5 and 7. The number 1 is not a prime number. 4, 6, 8, 9 and 10 are not prime numbers because they are divisible by at least one of the first four prime numbers. To find out if a two-digit number is a prime number you need to work out if it is divisible by one of the first four prime numbers, 2, 3, 5, and 7. A whole number which is not a prime number is called a composite number.

Examples: 29 is

not divisible by 2, 3, 5 or 7 29 is a prime number. 30
is divisible by 2, 3 and 5 30 is a composite number.

Write down the prime number in each group

1) 4, 5, 6 5) 43. 44, 45

2) 9, 10, 11 6) 51, 52, 52

3) 27, 28, 29 7) 61, 62, 63

4) 37, 38, 39 8) 77, 78, 79

CHALLENGE

Write down the two numbers in each group which are NOT prime numbers

1) 1, 2, 3, 4 4) 27, 37, 47, 57

2) 16, 17, 18, 19 5) 63, 73, 83, 93

3) 21, 31, 41, 51 6) 61, 71, 81, 91

Write down the next prime number after:

7) 8

8) 24

Wednesday: To identify prime numbers and composite numbers.

Including Challenge

Answers including Challenge.

Factors are numbers that divide exactly into another number. Two or more numbers may have common factors as well as 1. The largest of these is the highest common factor.

Examples;

Factors of 12

1, 2, 3, 4, 6, 12 (6 factors)

Factors of 30

1, 2, 3, 5, 6, 10, 15, 30 (8 factors)

Common factors of 12 and 30

1, 2, 3, 6

Highest common factor of 12 and 30 is

Write down the prime number in each group

1) 4, 5, 6 5 5) 43. 44, 45 43

2) 9, 10, 11

11 6) 51, 52, 52 53

3) 27, 28, 29

29 7) 61, 62, 63 61

4) 37, 38, 39

37 8) 77, 78, 79 79

CHALLENGE

Write down the two numbers in each group which are NOT prime numbers

1) 1, 2, 3, 4 1, 4 4) 27, 37, 47, 57 27, 57

2) 16, 17, 18, 19

16, 18 5) 63, 73, 83, 93 63, 93

3) 21, 31, 41, 51

21, 51 6) 61, 71, 81, 91 81, 91

Write down the next prime number after:

7) 8

8) 24 29

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