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### Question

What is 469 × 25?

**A**

11725.

**B**

11730.

**C**

11720.

**D**

11735.

**Soln.**

**Ans: a**

This is a multiplication by a power of 5. The best way is to observe that 25 = 5^{2}. There are 2 powers of 5. So append 2 zeroes and divide by 2^{2}, like this: $46900/4$ = 11725.