Friday, 18 January 2013

Going "deeper": Square Root, Cube Root

We did a discussion on the following in class.

Strategy proposed: 
  • Convert the decimal into fraction such that both numerator and denominator are whole numbers
  • Look out for multiples of "10": 100, 1000, 1 000, 10 000, etc. These are special numbers for square root and cube root
  • Use prime factorisation to help us to identify the prime factors before organising them in "identical" groups

These are the attempts before we discussed about the strategy:

After discussion, here's the suggested working:
Note that we should leave answers in fractions when possible (for accuracy), unless the context requires otherwise.

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