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# Numbers

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### Numbers

1. 1. UNIT 2 DIVISIBILITY Manuel Jiménez Martínez 1ºA
2. 2. INDEX - Divisibility- Multiples and factors - Prime number- Composite number- Rules of divisibility - H.C.F. -L.C.M.
3. 3. WHEN IS A NUMBER DIVISIBLE BY ANOTHER NUMBER? When the division is exact. EXAMPLE: 18 : 2 = 9 Eighteen is divisible by nine and two.
4. 4. When is a number multiple or factor of another number? When the division is exact EXAMPLE: 28 : 4 = 7 Twenty-eight is multiple of four Four is factor of twenty-eight
5. 5. What are prime numbers?Are numbers with only two divisors, 1 and itselfEXAMPLE: The prime numbers are 2,3,5,7,11, 13,17,19,23,29,31,37,41,43,47,53,59,61,67, 71,73,79,83,89 and 97.
6. 6. What are composite numbers?Are numbers with more than two divisors EXAMPLE: 10 = 1,2,5 and 10
7. 7. RULES OFDIVISIBILITY
8. 8. H.C.F. AND L.C.M● EXAMPLE: ● EXAMPLE:● H.C.F(18 and 9)= ● L.C.M(10 and 5)= 2·3·3= 18 ● 2·5= 10● 18=2·3·3 ● 10= 2·5● 9=3·3 ● 5= 5
9. 9. THE END