Exercise 4.4 1. Write each of the following rational numbers in the standard form: (i) 2/10 (ii) – 8/36 (iii) 4/-16 (iv) -15/-35 (v) 299/-161 (vi) – 63/- 210 (vii) 68/- 119 (viii) – 195/275 Solution: (i) The denominator is positive and HCF of 2 and 10 is 2. Therefore, Dividing the numerator and […]

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## RD Sharma Class 7 Math 4th Chapter Operations on Whole Numbers Exercise 4.3 Solution

Exercise 4.3 1. Determine whether the following rational numbers are in the lowest form or not: (i) 65/84 Solution: We observe that 65 and 84 have no common factor their HCF is 1. Thus, 65/84 is in its lowest form. (ii) (-15)/32 Solution: We observe that -15 and 32 have no common factor […]

## RD Sharma Class 7 Math 4th Chapter Operations on Whole Numbers Exercise 4.2 Solution

Exercise 4.2 1. Express each of the following as rational number with positive denominator: (i) (-15)/(-28) (ii) 6/(-9) (iii) (-28)/(-11) (iv) 19/(- 7) Solution: Rational number with positive denominators: (i) Multiplying the number by -1, we get: -15 – 28 = -15 x -1 – 28 x – 1 = 1528 (ii) Multiplying the […]

## RD Sharma Class 7 Math 4th Chapter Rational Numbers Exercise 4.1 Solution

Exercise 4.1 1. Write down the numerator of each of the following rational numbers: (i) -7/5 (ii) 15/(-4) (iii) (- 17)/(- 21) (iv) 8/9 (v) 5 Solution: Numerators are: (i) -7 (ii) 15 (iii) -17 (iv) 8 (v) 5 2. Write down the denominator of each of the following rational numbers: (i) – 4/5 […]

## RD Sharma Class 7 Math 3rd Chapter Decimals Exercise 3.3 Solution

Exercise 3.3 1. Divide: (i) 142.45 by 10 (ii) 54.25 by 10 (iii) 3.45 by 10 (iv) 0.57 by 10 (v) 0.0043 by 10 (vi) 0.004 by 10 Solution: (i) Given 142.45 by 10 Now shifting decimal point by one place to the we can get tge result 142.4/10 = 14.245 (ii) Given 54.25 […]

## RD Sharma Class 7 Math 3rd Chapter Decimals Exercise 3.2

Exercise 3.2 1. Find the product: (i) 4.74 x 10 Solution: Shifting the decimal point by one place to the right 4.74 x 10 = 47.4 (ii) 0.45 x 10 Solution: Shifting the decimal point by one place to the right 0.45 × 10 = 4.5 (iii) 0.0215 x 10 Solution: Shifting the decimal point […]

## RD Sharma Class 7 Math 3rd Chapter Decimals Exercise 3.1 Solution

Exercise 3.1 1. Write each of the following as decimals: (i) 8/100 Solution: Mark the decimal point two places from right to left Mark the decimal point one place from right to left 9/10 = 0.9 4/100 Mark the decimal point two places from right to left 4/100 = 0.04 = 20 + 0.9+ […]

## RD Sharma Class 7 Math 2nd Chapter Fractions Exercise 2.3 Solution

Exercise 2.3 1. Find the reciprocal of each of the following fractions and classify them as proper, improper and whole numbers (i) 3/7 (ii) 5/8 (iii) 9/7 (iv) 6/5 (v) 12/7 (vi) 1/8 Solution: (i) 3/7 7/3 = improper number (ii) 5/8 8/5 = improper number (iii) 9/7 7/9 = proper number (iv) 6/5 […]

## RD Sharma Class 7 Math 2nd Chapter Fractions Exercise 2.2 Solution

Exercise 2.2 1. Multiply 2. Find the product: (i) (4/7) ⨯(14/25) Solution: Given (4/7) ⨯(14/25) (4/7) ⨯(14/25)= (4⨯14)/ (725) = (56/175) Converting above fractions into simplest form = (8/25) (ii) 7 (1/2) ⨯2 (4/15) Solution: Given 7 (1/2) ⨯2 (4/15) We have convert mixed fractions into improper fractions Then we get (15/2) and (34/15) = […]

## RD Sharma Class 7 Math 2nd Chapter Fractions Exercise 2.1 Solution

Exercise 2.1 1. Compare the following fractions by using the symbol > or < or = ; Solution: (i) 7/9 and 8/13 Let us first find the LCM of 9 and 13 . We have 9×13 = 117 ∴ L.c.m of 9 and 3 is 117. Now , we convert the given fraction […]