Today, business as usual, some more 11-12 maths. We came across two types of difficult questions. They seemed tough, because my son did not cover this part of material yet.
So I explained to him how to subtract fractions if you have to make mixed ones to be able to perform the operation:
e.g. 3 1/7 - 1 2/7 =
(3 and one seventh minus 1 and 2 sevenths)
I know this kind of subtraction is covered in secondary school, but my child was more than happy to learn it now. Why should I stop him?
Another question went like this:
Three friends, called them: A, B, C had altogether £1.70
Once A gave 2p back to B and C gave 3p back to B, they discovered that B had twice as much money as C and A had twoice as much as B.
So how much money did they have each before and after?
My son surprised me. He thought he would not be able to solve this problem himself, but he applied ratio (I had explained it to him 4-5 months ago) and voila! he got the right answer!
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