Wednesday 2nd December 2020
LC- To multiply fractions
Well done for all your hard work on fractions. We are now going to move on to multiplying fractions. Have a look at the problem below. See if you can represent your working out with a diagram.
So if the pizza was cut into thirds and one piece is gone, there are 2/3 left. Basically 2 pieces are left. If we cut these 2 pieces on half, what do we have left?
Think about this:
If we have 5 groups of 2, what calculation would it be? Add, subtract, multiply or divide? So what does the word, 'of' mean here? It means multiply. 5 groups multiplied by 2. Have a look again at the question above. The word 'of' has been used so to find the answer, we need to multiply.
So to find 1/2 of 2/3 we need to do the following calculation 1/2 x 2/3 =
So what is half of 2/5?
Remember there are 2 pieces, so half of those 2 = ???????
That's right 1 piece so half of 2/5 = 1/5
What about 1/2 x 2/7 =
1/2 of 2/9 =
Half of 2 will always be 1. Half x 2 = 1
Let's try the guided practice. The pictures (bar graphs) really help here so look carefully and think what they are showing you.