Concept: Number of Zeroes in Expression

The number of zero’s in any expression depends on number of combination of (2 *5) present in that expression.
Hence zeros are formed by the combination of 2 & 5

For Example;

Suppose you are asked to find number of zeros in following expression
8 * 15 * 23 * 17 * 25 * 22

Step 1: Do the Factor Representation

Step 2: Find the combination of 2 and 5, to find number of zeros in the expression