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When a decimal part is multiplied by \(10, 100, 1000\), etc.,
it is enough to move the point by \(1, 2, 3\), etc., digits to the right respectively.
When a decimal part is divided by \(10, 100, 1000,\) etc.,
it is enough to move the point by \(1, 2, 3\), etc. digits to the left respectively.
Multiplication
\(19.23\) \(10 = 192.3\) | The point moves \(1\) digit to the right |
\(19.234\) \(100 = 1923.4\) | The point moves \(2\) digit to the right |
\(19.345\) \(1000 = 19234.5\) | The point moves \(3\) digit to the right |
Dividing
\(99.2345 : 10=9.92345\) | The point moves \(1\) digit to the left. |
\(99.2345 : 100=0.992345\) | The point moves \(2\) digits to the left. |
\(99.2345 : 1000=0.0992345\) | The point moves \(3\) digits to the left. |
\(99.2345 : 10000=0.00992345\) | The point moves \(4\) digits to the left. |
"If necessary, many zeros may be added or dropped before or after the decimal as they do not change the value."
Example:
\(0.2 : 100 = 000.2 : 100 = 0.002\)
\(0.2\)\(1000 = 0.200\)\(1000 = 200\)