We have, \(0.25=\frac { 25 }{ 100 } =\frac { 25\div 25 }{ 100\div 25 } =\frac { 1 }{ 4 } \)
\(\left[ \because HCF\quad of\quad 25\quad and\quad 100=25 \right] \)

We have, \(0.18=\frac { 18 }{ 100 } =\frac { 18\div 2 }{ 100\div 2 } =\frac { 9 }{ 50 } \)
\(\left[ \because \quad HCF\quad of\quad 18\quad and\quad 100\quad =2 \right] \)

We have, \(20+9+\frac { 4 }{ 10 } +\frac { 1 }{ 100 } =29+4\times \frac { 1 }{ 10 } +1\times \frac { 1 }{ 100 } \)
= 29 + 0.4 + 0.01 = 29.41

We have, 2.25=2 ones + 2 tenths + 5 hundredths = 2 + 2 \(\times\) \(\frac { 1 }{ 10 } +\frac { 5 }{ 100 } =2+0.25\)
\(=2+\frac { 2 }{ 10 } +\frac { 5 }{ 100 } =2+\frac { 20+5 }{ 100 } =2+\frac { 25 }{ 100 } =2+\frac { 1 }{ 4 } =2\frac { 1 }{ 4 } =\frac { 9 }{ 4 } .\)

17.6

0.3

We know that, 10 mm = 1 cm \(\Rightarrow\) 1 mm = 1/10 cm
\(\therefore \quad 2\quad mm=2\times \frac { 1 }{ 10 } cm=\frac { 2 }{ 10 } cm=0.2\quad cm\)

Fraction of 6.4=\(\frac { 64 }{ 10 } \) and lowest form =\(\frac { 32 }{ 5 } \) 

We have, \(1.0=1+\frac { 0 }{ 10 } =1+0=1\)
\(\therefore \) Fraction of 1.0 as well as lowest form = 1

We have, 2.5=2+\(\frac { 5 }{ 10 } =\frac { 2\times 10 }{ 1\times 10 } +\frac { 5 }{ 10 } \)
[multiplying by 10 in numerator and denominator of 2]
\(=\frac { 20 }{ 10 } +\frac { 5 }{ 10 } =\frac { 20+5 }{ 10 } =\frac { 25 }{ 10 } \)
Lowest form \(=\frac { 25\div 5 }{ 10\div 5 } =\frac { 5 }{ 2 } \) [\(\because\) HCF of 25 and 10 = 5]
\(\therefore\) Fraction of 2.5\(=\frac { 25 }{ 10 } \) and lowest form = \(\frac { 5 }{ 2 } \)

\(4\frac { 1 }{ 2 } =4+\frac { 1 }{ 2 } =4.5\)

\(\cfrac { 12 }{ 5 } =\cfrac { 12\times 2 }{ 5\times 2 } =\cfrac { 24 }{ 10 } =\cfrac { 20+4 }{ 10 } \)
=\(\cfrac { 20 }{ 10 } +\cfrac { 4 }{ 10 } =2+\cfrac { 4 }{ 10 } =2.4\)

We have, \(\frac { 2 }{ 5 } \)
To make this fraction in tenths, we have to multiply by 2 in its numerator and denominator both.
\(\therefore \quad \frac { 2 }{ 5 } =\frac { 2\times 2 }{ 5\times 2 } =\frac { 4 }{ 10 } \)
Here, it has 4 tenths.
i.e. \(\frac { 4 }{ 10 } =0.4\)

One hundred and two ones = 1 \(\times\)100 + 0 \(\times\) 10 + 2 \(\times\) 1
= 100 + 0 + 2 = 102

Fourteen point six = 14.6