Blog Before Test

A muddy point of mine was deciding when to cross multiply. Maybe, we could put a rule for when to cross multiplication. Just today, we when over when to use cross multiplication. ONLY use the cross multiplying rule when solve an equivalent fraction equation.

I thought the weekend homework, Exercise 52 was tough. I when to talk to Mr. K. After, a long while of conferencing, I learned when and how to cross multiply properly. After, the meeting I had a better feeling. I felt better, but still a little worried.

Today, Mr. K told my a funny story of how the "Pythagorean theorem." On exercise 52, question 12, it says "John is building a house 20-m by 10-m but he lost his carpenter square. How can he make sure his house found is at right angles without buying another square?" A carpenter square is a triangles that is 3 by 4 by 5. Which is 3² by 4² by 5². Which equals to 9 + 16 = 25. The conclusion is that home builder's use the "Pythagorean theorem" in real life.