Radha is drawing a dot Rangoli (a beautiful pattern of lines joining dots) with chalk powder. She has 9 dots in a row. How many dots will her Rangoli have for r rows? How many dots are there if there are 8 rows? If there are 10 rows?

Solution:

We will apply the multiplication rule for expressing the number of dots in r rows of rangoli

We know that each row of rangoli has 9 dots.

Let the number of rows be r.

Total number of dots in r rows = Number of dots in each row × Number of rows

⇒ Total dots in r rows = 9 × r

If number of rows are r = 8 and r = 10

Number of dots for 8 rows = 9 × 8 = 72

Number of dots for 10 rows = 9 × 10 = 90

Therefore, the total number of dots in r rows will be 9r

NCERT Solutions for Class 6 Maths Chapter 11 Exercise 11.1 Question 7

Radha is drawing a dot Rangoli (a beautiful pattern of lines joining dots) with chalk powder. She has 9 dots in a row. How many dots will her Rangoli have for r rows? How many dots are there if there are 8 rows? If there are 10 rows?

Summary:

It is given that Radha is drawing a dot rangoli with chalk powder and she has 9 dots in a row. We have found that the number of dots in a given number of rows is 9r

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