James's answer to Rin's Secondary 1 Maths Singapore question.
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Firstly, you cant directly compare denominatprs and numerators like that.
Why?
Given a valid equation 2/3 = 4/6, can i say that 2 = 4 and 3 = 6? Obviously, we cant do that. So when algebra is mixed in to the equation, we cant for sure say that when the correct unknowns are added in, the numerators and denominators will be the same. So never assume that they will be the same, so always cross multiply.
Why?
Given a valid equation 2/3 = 4/6, can i say that 2 = 4 and 3 = 6? Obviously, we cant do that. So when algebra is mixed in to the equation, we cant for sure say that when the correct unknowns are added in, the numerators and denominators will be the same. So never assume that they will be the same, so always cross multiply.
Date Posted:
3 years ago
oh,i see.thanks :)
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