Question

How many inches are there in 54 cm ?

Answer 1

Hint: Here, we will use the unitary method and the concept of multiplication to convert 54 cm into inches. The required number of inches can be found out by multiplying the number of inches in 1 cm by the total number of cm to be converted.

Complete step-by-step answer:
We know that 1 inch is equal to \[2.54\] cm.
This can be written as
\[2.54\] cm \[ = \] 1 inch
The total number of cm to be converted is 54 cm.
We will use a unitary method to find the number of inches in 1 cm.
Dividing both sides by \[2.54\], we get
\[ \Rightarrow \] 1 cm \[ = \] \[\dfrac{1}{{2.54}}\] inch
Now, we will use the concept of multiplication to convert 54 cm to inches.
Number of inches in 54 cm \[ = \] Number of inches in 1 cm \[ \times \] Total number of cm to be converted
Therefore, we get
Number of inches in 54 cm \[ = \dfrac{1}{{2.54}} \times 54\]
Simplifying the expression, we get
Number of inches in 54 cm \[ \approx 21.26\]
Therefore, 54 cm is approximately \[21.26\] inches.

Note: We used the unitary method to find the number of inches in 1 cm. The unitary method is a method where first, the per unit quantity is calculated, and then the number of units are multiplied. Here, we calculated the value of 1 inch in cm.
Multiplication is the repeated addition of equal groups. It helps in adding multiple equal groups quickly. It is denoted by the symbol \[ \times \]. Brackets may also be used to denote multiplication.
We used the concept of multiplication to add \[\dfrac{1}{{2.54}}\] 54 times.