CBSE Class 8 Mathematics Rational Numbers Assignment Set 07

Problem Sums

Question. The product of two numbers is 60. If one of them is \(7\frac{1}{2}\). Find the other.
Answer: \(8\)

Question. \(12\frac{1}{4}\) metre cloth costs Rs \(212\frac{1}{3}\). Find the Cost of 1 metre cloth.
Answer: Rs \(17\frac{1}{3}\)

Question. With what number should we multiply \(\frac{-15}{28}\) so that the product be \(-\frac{5}{7}\) ?
Answer: \(\frac{4}{3}\)

Question. The sum of two rational numbers is \(-8\). If one of the number is \(-\frac{15}{7}\). Find the other.
Answer: \(\frac{-41}{7}\)

Question. What number should be added to \(-\frac{7}{8}\) so as to get \(\frac{5}{9}\)?
Answer: \(\frac{103}{72}\)

Question. Anita bought \(3\frac{1}{2}\) m ribbon at Rs \(5\frac{3}{7}\) per metre, \(4\frac{3}{4}\) m cloth at Rs \(27\frac{1}{2}\) per metre. How much money did she spend?
Answer: Rs \(149\frac{5}{8}\)

Question. Sunita bought \(2\frac{1}{2}\) kg Onion at Rs 10 per kg and \(1\frac{3}{8}\) kg potato at Rs \(16\frac{8}{11}\) per kg. How much money did she give to the shopkeeper?
Answer: Rs 48

Question. The area of a rectangle is \(26\frac{1}{4}\) m\(^2\). If its length is \(17\frac{1}{2}\) m. Find its width
Answer: \(1\frac{1}{2}\) m.

Question. Divide the sum of \(-\frac{2}{3}\) and \(\frac{1}{5}\) by their product
Answer: \(\frac{7}{2}\)

Question. A Salwar needs \(2\frac{1}{2}\) m cloth. How many Salwars can be made from \(27\frac{1}{2}\) m cloth.
Answer: 11

Question. A man has Rs 150 with him. He bought \(4\frac{1}{2}\) litres of milk at Rs 24 per litre. How much money left with him?
Answer: Rs 42

Question. Anil has to cover \(12\frac{1}{2}\) km distance to reach the school. If his speed is 5 km/hr, how much time he will take to reach the school?
Answer: \(2\frac{1}{2}\) Hrs.

Question. Sum of two numbers is \(7\frac{1}{2}\) and if one of them is \(1\frac{1}{4}\) , Find the other number
Answer: \(6\frac{1}{4}\)

Question. A boy walks \(\frac{2}{3}\) km from a place Q towards North and then from there \(1\frac{3}{5}\) km towards South. Where will he be now from Q.?
Answer: \(\frac{14}{15}\) km South

Question. Subtract \(1\frac{2}{3}\) from the sum of \(\frac{1}{3}\) and \(\frac{1}{5}\)
Answer: \(\frac{-17}{15}\)