Question

For Amit’s birthday, a cake of weight 250 g was ordered. What is the weight of the cake in kg ?

Answer 1

Hint: We will use the unitary method to solve this question. We know that, $1kg=1000g$, so we can get the value of $1g=\dfrac{1}{1000}kg$. Thus, we have to similarly convert 250 g into kg by multiplying it with $\dfrac{1}{1000}kg$.

Complete step-by-step answer:
It is given in the question that for Amit’s birthday, a cake of weight 250 g was ordered and we have to find the weight of the cake in kg. We will be using the unitary method to solve this question. Basically, the unitary method is a mathematical approach in which we find the value of 1 unit and multiply it with the required number to get the desired values. We know that 1 kg is equal to 1000 kg. So, we will get that $1g=\dfrac{1}{1000}kg$. Now, we have the weight of the cake given to us in grams, that is 250 g. So, we can convert this into kg by multiplying it with $\dfrac{1}{1000}kg$. So, we will get,
Weight of cake in kg = $250\times \dfrac{1}{1000}=0.250kg\Rightarrow 0.25kg$.
Therefore, the weight of the 250 g cake will be equal to 0.25 kg.

Note: Many students make a mistake and directly multiply 250 by 1000, as 1000 g = 1 kg and get the answer as 250000 kg. It is totally wrong and therefore the students should be careful with the conversion of units.