- Rational Numbers
- Linear Equations in One Variable
- Understanding Quadrilaterals
- Practical Geometry
- Data Handling
- Squares and Square Roots
- Cubes and Cube Roots
- Comparing Quantities
- Algebraic Expressions and Identities
- Visualising Solid Shapes
- Mensuration
- Exponents and Powers
- Direct and Inverse Proportions
- Factorisation
- Introduction to Graphs
- Playing with Numbers
NCERT Solutions Class 8 Mathematics Solutions for Exercise 1.1 in Chapter 1 - Rational Numbers
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Q4) Find the multiplicative inverse of the following.
(i) – 13
(ii)\frac{-13}{19}
(iii) \frac{1}{5}
(iv) \frac{-5}{8}\times\ \frac{-3}{7}
(v) -1 \times\frac{-2}{5}
(vi) -1
Solutions 4:
(i): We know that the multiplicative inverse of rational number 'a' is (\frac{1}{a}), such that a \times\frac{1}{a}= 1
Therefore, Multiplicative inverse of -13 is -\frac{1}{13}.
(ii): We know that the multiplicative inverse of rational number 'a' is \frac{1}{a} such thata\ \times\frac{1}{a} = 1
Therefore, Multiplicative inverse of \frac{-13}{19}\ is\ \frac{-19}{13}.
(iii): We know that the multiplicative inverse of rational number 'a' is \frac{1}{a} such that a\times\frac{1}{a} = 1
Therefore, Multiplicative inverse of \frac{1}{5}\ is\ 5
(iv): We know that the multiplicative inverse of rational number 'a' is \frac{1}{a} such that a x \frac{1}{a}= 1
Therefore,
Multiplicative Inverse of\frac{15}{56\ }\ is\ \frac{56}{15}.
(v): We know that the multiplicative inverse of a rational number 'a' is \frac{1}{a} such that a x \frac{1}{a} = 1
Therefore, Multiplicative inverse of \frac{2}{5}\ is\ \frac{5}{2}.
(vi): We know that Multiplicative inverse of 'a' is \frac{1}{a}, such that a x \frac{1}{a}= 1
Therefore, Multiplication inverse of -1 is \frac{1}{-1}
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