1596 divide 1344 * 784 divide 1824 * 24 divide 42

how to whiteout calculator and what is the use of using decimal number(floating point) in calculation in real it is 1 2 3 4........

Just for the record, I would make a new thread if you have a different question...

... the above can be written as

\(\displaystyle \frac{1596}{1344} \times \frac{784}{1824} \times \frac{24}{42}\)

Do you know about cancelling? You divide the top and bottom numbers by the same quantity, so, for example, 6 goes into 24 four times and into 42 seven times, so

\(\displaystyle \frac{1596}{1344} \times \frac{784}{1824} \times \frac{^{4}\cancel{24}}{^{7}\cancel{42}}\)

The same can be done with the other numbers too. So, for example, 2 goes into 1596 seven hundred and ninety eight times and into 1824 nine hundred and twelve times, so

\(\displaystyle \frac{^{798}\cancel{1596}}{1344} \times \frac{784}{^{912}\cancel{1824}} \times \frac{^{4}\cancel{24}}{^{7}\cancel{42}}\)

so keep going until the numbers are really small and then work out the final result after you've finished cancelling