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Basic fractions

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Introduction to fractions

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Basic fractions

1. 1. IES Granadilla de Abona CLIL Proyect Beatriz E. Afonso Martínez
2. 2.  A fraction is a method of counting parts of a thing.  The Egyptians were using fractions 40,000 years ago! 4 1
3. 3.  The top number of a fraction is called NUMERATOR.  The bottom number of a fraction is called DENOMINATOR. RDENOMINATO NUMERATOR
4. 4. one half two thirds three quarters two fifths four sixths  In spoken English people say the numerator as a cardinal number followed by the ordinal of the denominator + ”s”.  For example: 3 2 2 1 4 3 5 2 6 4
5. 5.  In Maths, when we use fractions we usually say the numerator OVER the denominator. Four over six Four over twelve Two over ten 6 4 12 4 10 2
6. 6.  Can you read the following fractions? (Try to think of the usual way instead of the mathematical way) 6 4 .a 2 1 .b 4 12 .c 5 3 .d 7 5 .e 12 11 .f 8 8 .g 10 1 .h
7. 7.  This shape is divided into 2 equal parts. One half is blue. Make a similar statement about each of the following shapes: A B C D E F
8. 8. A B C D E What fraction of the others is shaded?
9. 9.  One half of six: 3  A quarter of eight 2  One third of nine 3  One fifth of ten 2  One tenth of thirty 3
10. 10.  One half of 10€: 5€  One third of £15 £5  A quarter of £40 £10  One fifth of 20\$ 4\$  One tenth of 80€ 8€
11. 11.  Three quarters  Seven twelves  Three eights
12. 12.  Seven over twenty  Two ninths  Five over twelve
13. 13. 1. In a group of students. a. One tenth are boys. What fraction are girls? b. Three quarters have brown hair. What fraction don’t have brown hair? c. Three fifths don’t wear glasses. What fraction wear glasses? d. Five over eight can swim. What fraction can’t swim? e. Seventeen over twenty are on time for school. What fraction are late?
14. 14. 2. A football match last 90 minutes. How long is the first half? 3. How many minutes are there in a quarter of an hour? 4. How many minutes are there in three quarters of an hour? 5. In a street of 30 houses two thirds have alarms. 1. How many are alarmed? 2. How many are not alarmed? 6. How many months are there in 1. half of a year? 2. a quarter of a year? 3. Three quarters of a year?
15. 15. A man is like a fraction whose numerator is what he is and whose denominator is what he thinks of himself. The larger the denominator, the smaller the fraction. Tolstoy