Theory:

ii) Division of a decimal number by a whole number
Let us learn how to divide the decimal number by a whole number.
 
i) \(8.4 ÷ 2\)
 
\(8.4 ÷ 2 =\) 8.42=8.4×12. We can write \(8.4\) as 8410.
 
So, 8410×12=844210×12=4210=4.2
 
Therefore, 8.42=4.2.
 
In another way, we can divide given expression using the normal division method.
 
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iii) Division of a decimal number by another decimal number:
i) Find the value of \(30.8 ÷ 0.7\).
 
The given expression 30.80.7. We can rewrite it as 30810710=30810×107.
 
Let us simplify it.
 
30810×107=3087=44
 
Therefore, the value of \(30.8 ÷ 0.7\) is \(44\).
 
 
ii) Find the value of \(115.2 ÷ 0.9\).
 
Similarly, we can rewrite the given expression 115.20.9 as 115210910=115210×109.
 
\(=\) 115210×109=11529=128.
 
Therefore, \(115.2 ÷ 0.9 = 128\).