SLIDE 1
2
Multiples and divisors
- Definition
- Equivalence between both concepts
- To find the multiples and divisors of a
number
- Properties
DIVISIBILITY OF THE NATURAL NUMBERS Degree in Primary Education - - PowerPoint PPT Presentation
DIVISIBILITY OF THE NATURAL NUMBERS Degree in Primary Education - - PowerPoint PPT Presentation
Mathematics and Associated Teaching Methods I DIVISIBILITY OF THE NATURAL NUMBERS Degree in Primary Education Teaching Multiples and divisors Definition Equivalence between both concepts To find the multiples and divisors of a
SLIDE 2
SLIDE 3
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Divisibility criteria
- By 2
- By 3
- By 4
- By 5
- By 6
- By 9
- By 10
- By 11
- …
SLIDE 4
4
Prime and composite numbers
- Definition
- Quantity of prime numbers
- To find out if a number is prime
- Eratosthens sieve
- Decomposition in prime factors
SLIDE 5
5
Greatest common divisor
- Definition
- Computation of the g.c.d.:
– By definition – Algorithm by decomposition in prime factors – Euclides’ algorithm
- Co-prime numbers
SLIDE 6
6
Least common multiple
- Definition
- Computation of the l.c.m.:
– By definition – Algorithm by decomposition in prime factors
SLIDE 7
Theorem
The product of two natural numbers is the product of their g.c.d. and their l.c.m.
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