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Science,English,and math Ⅱ

No.37　17/05/02 09:09
燻し銀三 ( 50代 ♂ Oe38xe ) あ+あ-

【Expansion to a rational number】

《The concept of a number extends from the four basic operation of arithmetic to a rational number》

The last rectangle is black on the part of five-sixths.

The first two rectangles means the fractional numbers which aren't reduced to common denominators. The former is a half and the latter is one third.

The second three rectangles are the fractional number which are reduced to common denominators. The first is one-third,the second one is half,and the last one is five-sixths.

As for the fractional number,we can't add any of them if their denominators are different. In short reducing of fractions to a common denominator means that different sizes of the rectangles change into the same size,so we can count them easily.When each size is different,neither we can add nor subtract exactly.

When multiplying each two of minus number,its answer is plus. Why? It's other simple question.

ー2 × 3 ＝ー６ It means that minus 2 is added three times,so it's …