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Pooja knows that every pair of 2 and 5 makes a 10. How many zeros are at the end of $2^{6} \times 5^{4}$ ?

Class 7Prime Factors in Exponent FormNumber System

A4
B2
C6
D10

Step-by-Step Solution

Only 4 pairs of (2, 5) can be made, since there are just four 5s:

2^{6} \times 5^{4} = 2^{2} \times 1 0^{4} = 40000

. It ends in 4 zeros.

Answer: A) 4

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