Fractions 4.0 / 5 based on 5 ratings ? MathematicsFractions, decimals and percentagesGCSEAll boards Created by: daviesgCreated on: 05-01-14 19:37 How do you add two fractions? Make them into equivalent fractions with a common denominator then add the numerator only 1 of 12 Example: 3/4 + 2/5 15/20 + 8/20 = 23/20 = 1 3/20 (mixed number) 2 of 12 How do you multiply two fractions? Multiply the numerators and multiply the denominators, then cancel down 3 of 12 Example: 3/4 x 2/5 (3 x 2)/(4 x 5) = 6/20 = 3/10 4 of 12 How do you divide two fractions? Turn the SECOND fraction upsidedown then MULTIPLY as card 3 5 of 12 Example: 3/4 / 2/5 3/4 x 5/2 = (3 x 5)/(4 x 2) = 15/8 = 1 7/8 (mixed number) 6 of 12 Find 2/5 of £3.50 1/5 of £3.50 = 70p (=£3.50 / 5) so 2/5 of £3.50 is £1.40 7 of 12 How do you multiply using Mixed numbers? Change to improper fraction first then multiply and simplify 8 of 12 2 3/4 x 3 1/3 11/4 x 10/3 = 110/12 = 55/6 = 9 1/6 9 of 12 How do you find a percentage of a number? Turn the percentage into a fraction over 100, then multiply as card 3 10 of 12 Find 24% of £2.50 24/100 x 2.5 = 6/25 x 5/2 = 30/50 = 3/5 = 60 pence (1/5 of £1 is 20p) 11 of 12 Quick tip: Find 24% of £25 (Swap the numbers around) Same as 25% of 24 i.e. 1/4 of 24 = £6 12 of 12
Comments
Report
Report
Report
Report
Report
Report