Question 53

The value of $$515\times485$$ is:

Solution

$$515\times485$$

= $$(500 + 15)\times(500 - 15)$$

= $$(500)^2 - (15)^2$$

($$\because (a - b)(a + b) = a^2 - b^2$$)

= 250000 = 225 = 249775


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