Tuesday , May 26 2020
Mathematics

NCERT 5th Class (CBSE) Mathematics: Ratio And Proportion

Yash is an artist trying to find the perfect shade of green for his new painting. He is mixing. He is mixing tubes of yellow and blue paint to find his ‘perfect’ green.

Mixing tubes

Subtraction is one way to compare the quantities of yellow and blue paint that Yash used 2 tubes (of blue) – 1 tube (of yellow) = 1 tube. So, we can say that he used one more tube of blue paint than yellow paint to find his perfect green.

Another way to compare the amounts of yellow and blue paint is to use ration.

A ratio compares like quantities.

The ration of the yellow tubes to the blue tubes is 1:2 and read as 1 is to 2 or 1 to 2.

we can write it as 1 : 2, 1 to 2 or 1/2. ← Written in from a ration looks like a fraction

Look at this group of parrots and sparrows. the ratio of parrots to sparrows is 3 parrots to 4 sparrows.

Group parrots and sparrows

We write it as 3 : 4, 3 to 4 or 3/4

We say the ration of parrots to sparrows is three is to four.

The ratio of sparrows to parrots is 4 sparrows to 3 parrots.

We write it as 4 : 3, 4 to 3 or 4/3

We say the ratio of sparrow to parrots is four is to three.

CHECKPOINT

  1. The order of numbers in a ratio is very important.
  2. The second term in a ratio cannot be zero.

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