Answer

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**Hint:**Convert all the units into one unit. Here, you can convert centimetre to metre and proceed to your calculations. For a number of shirts; remember, it must be a whole number since shirts can never be in decimals either it be whole or none.

**Complete step by step solution:**

Total length of cloth that Mohini has=$30$m

Length of cloth required for each shirt=$2$m$30$ cm

Now, we will convert centimetre to metre for ease of calculation.

As we know, $1$m$=100$cm

Using unit method,

$1$cm$=\dfrac{1}{100}$m

$30$cm$=\dfrac{1}{100}30$m$=0.3$m

We get$30cm$equal to$0.3m$ with the help of conversion of units of measurement and unit method.

Therefore, length of cloth required for each shirt in metre is $2m+0.3m=2.3m$

Number of shirts made =$\dfrac{\text{total length of cloth}}{\text{length of cloth of each shirt}}$

Number of shirts=n= $\dfrac{30}{2.3}=13.04$

Since the number of shirts cannot be a fractional quantity, it must be a natural/whole number.

Therefore, $n<13.04$ n must be the greatest natural number less than $13.04$. Thus n=$13$.

**$13$ Shirts have been made by Mohini for her son.**

Length of cloth left=Total length of cloth-length of cloth required for $13$ shirts

Length of cloth required for $13$ shirts = $13\times $ length of cloth for one shirt

$=13\times 2.3$

=$29.9$m

Length of cloth left= $30-29.9$

$=0.1$m

Conversion of unit of measurements; $1$m$=100$cm

$0.1m=0.1\times 100=10cm$

**Length of cloth left is $10$ cm or $0.1$m.**

**Note:**

You can also convert metre into centimetre and then proceed with your calculation. It depends on you which conversion you have to take to solve your question.

You can take $30$ m of cloth as $3000$ cm and length of cloth required can be taken as $230$ cm and solve your question to get to your answer, you will get the same result but in centimetre.

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