Question

8. Compute the squares of two digit numbers
which has 5 in its unit digit. Do you find a
rule? Apply the rule to compute square of
three digit numbers having unit digit as 5
without squaring the number. Hence find the
rule for squaring a four digit number having
unit digit as 5.​

Answer 1

Answer:

Occasionally in math, there's a shortcut that actually works, no matter what. One of these shortcuts shows up when you need to find the square of a number that ends in 5.

This applies for all numbers that end in 5. Instead of writing all those numbers down, we're going to abbreviate it as N5. The N stands for anything that comes before the 5.

For example, if our number is 435, N would be 43 (the stuff before the 5).

If our number is 5165, what is N?

Step-by-step explanation:

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