Radha isdrawing a dot Rangoli (a beautiful pattern of lines joining dots withchalk powder. She has 9 dots in a row. How many dots will her Rangolihave for r rows? How many dots are there if there are 8 rows?If there are 10 rows?

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Solution

Number ofdots in 1 row = 9
Number ofrows = r
Totalnumber of dots in r rows = Number of rows × Number ofdots in a row
= 9r
Number ofdots in 8 rows = 8 × 9 = 72
Number ofdots in 10 rows = 10 × 9 = 90

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Radha isdrawing a dot Rangoli (a beautiful pattern of lines joining dots withchalk powder. She has 9 dots in a row. How many dots will her Rangolihave for r rows? How many dots are there if there are 8 rows?If there are 10 rows?

Number ofdots in 1 row = 9Number ofrows = rTotalnumber of dots in r rows = Number of rows × Number ofdots in a row= 9rNumber ofdots in 8 rows = 8 × 9 = 72Number ofdots in 10 rows = 10 × 9 = 90

Number ofdots in 1 row = 9
Number ofrows = r
Totalnumber of dots in r rows = Number of rows × Number ofdots in a row
= 9r
Number ofdots in 8 rows = 8 × 9 = 72
Number ofdots in 10 rows = 10 × 9 = 90