# Fractions maths

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Category: Education

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### Fractions :

Fractions Math project Done by Polman

### Fractions-history :

Fractions-history Were used already during 1800BC. Babylonians invented it In 1650BC, Egypt start to use them In 100AD, the Chinese devise a system for calculation with fractions 1585, Simon Stevin sets out a theory of decimal fractions. From the 17th century, fractions are commonly used until today.

### Fractions: What are they? :

Fractions: What are they? Example: Fractions is used in math to represent parts.

### Fractions :

Fractions 1/2 2 is the whole number 1 represents the part / divide Numerator Denominator

### Fractions :

Fractions Fractions can be expressed as Percents, decimals and ratios Example: ½ = 50% Example ½ = 0.5 Example ½ = 1:2 Denominator of a fraction is always 100% Example: ½ = the two is 100%

Fractions: Addition Example: ¾ + 2/3=? Step one: common Denominator: 3, 4 Denominator: 12 Step 2: multiply nominator to give 12: 3x3=9 and 2x4=8 Step 3: 9/12+8/12= 17/12 17/12 is the final result

### Fractions: Substraction :

Fractions: Substraction Substraction is the same as addition, except we do minus instead of plus: Example on table: 4/7 – 3/5=?

### Fractions: Multiplication :

Fractions: Multiplication 2 examples: ½ x 7/3= 7/6....just multiply nominator*nominator and denominator*denominator Multiplication of mixed numbers: 3x2 ¾ =? Result= 33/4

### Fractions: division :

Fractions: division Example: 3:4/5= 3x5/4 Just switch the fraction‘s nominator with denominator..show on board.

### Fraction: decimals :

Fraction: decimals ½ = just divide 1 by 2 = 0.5 ¾ = just divide 3 by 4 = 0.75 Examples on board: 9/17 Result: 0.529