Theory:

Kishore bought \(10\) movie tickets for his friends, which total cost \(₹ 1555\). Now can you calculate what was price for each movie ticket?
 
We can get it by dividing the total amount spent by the total number of tickets.
 
That is 155510, which gives \(₹ 155.5\).
 
Let us see what happens if a decimal number is divided by \(10\), \(100\) and \(1000\).
 
80.39÷10=8.039526.073÷10=52.6073
80.39÷100=0.804526.073÷100=5.26073
80.39÷1000=0.08526.073÷1000=0.52607
 
From the table, we can observe that:
  • When a decimal number is divided by \(10\), the decimal point in the product is shifted by one place to the left side.
  • When a decimal number is multiplied by \(100\), the decimal point in the product is shifted by two-place to the left side.
  • When a decimal number is multiplied by \(1000\), the decimal point in the product is shifted by three-place to the left side.
Therefore, when a decimal number is divided by \(10\), \(100\) or \(1000\), the digits in the product are same as in the decimal number, but the decimal point in the product is shifted to the left side by as many places as there are zeros followed by \(1\).
Similarly, when we divide the decimal number by the following numbers:
  • \(0.1\), the decimal point moves one-place right.
  • \(0.01\), the decimal point moves two-places right.
  • \(0.01\), the decimal point moves three-places right.
Let us see some decimal numbers divided by \(0.1\), \(0.01\), and \(0.001\).
 
\(42.21 ÷ 0.1 = 422.1\)\(899.75 ÷ 0.1 = 8997.5\)
\(42.21 ÷ 0.01 = 4221\)\(899.75 ÷ 0.01 = 8.9975\)
\(42.21 ÷ 0.001 = 42210\)\(899.75 ÷ 0.001 = 899750\)