Level 5-6 Numbers - Fractions - Multiplication and Division
You will come across fractions in everyday life - half a pint of milk, quarter of an ounce of butter, an eighth of a pizza etc. Fractions are everywhere so you won't be surprised to find them in KS3 Maths.
Multiplying fractions is relatively easy. All you have to do is change any mixed numbers to top heavy fractions, then multiply the top row, and multiply the bottom row. So, to multiply 11⁄4 x 2⁄5 first change 11⁄4 to 5⁄4. Next multiply 5 x 2 and 4 x 5 to get 10⁄20. Always look to see if you can cancel down: 10⁄20 is the same as 1⁄2.
Dividing fractions is similar to multiplying, except you invert the second fraction, and change the divide sign to multiply. So, 11⁄4 ÷ 2⁄5 would be 5⁄4 x 5⁄2. 5 x 5 = 25 and 4 x 2 = 8 so your answer is 25⁄8 or 31⁄8.
Practise your multiplication and division of fractions in the following quiz. Good luck!
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