Maths 2
17/05/21
L.C. To be able to subtract a fraction from a mixed number.
Tell your partner, which of the 2 methods from this morning’s lesson did you prefer.
What is the problem asking us to do?
What do we know?
What operation do you think we need to perform?
We know we have 11⁄4 kg of flour and we want to remove 3⁄4 kg.
The easiest way to calculate this is to change 11⁄4 kg into quarters.
1 whole = 4⁄4; add that to 1⁄4 and we get 5⁄4, which is equivalent to 11⁄4.
Now we can easily calculate 5⁄4 – 3⁄4 to get 2⁄4.
What do we know about 2⁄4?
Is it the same as another simpler fraction?
Can we divide to find the equivalence?
Is there another way to calculate the answer to the problem?
We can partition 11⁄4 into 1 whole and 1⁄4.
We can subtract 3⁄4 from 1 whole because we know that 4⁄4 = 1
so 1 – 3⁄4 =
4⁄4 – 3⁄4 = 1⁄4
Then we can add on the remaining 1⁄4 to give us 2⁄4 or a half.
When learning, it is important to practice various methods.
Just like this morning, we will practice both methods we have learnt.
