The least number to be added to 435 to make it a perfect square is?
first let us find the square root of 435
=> $$\sqrt{435}$$
=>20.85........
now let us round of it to the next hundred
=>21 approx
=>now,
=>$$21^2$$
=>441
so the perfect square after 435 is 441
so The least number that must be added to 435 to make it a perfect square
=>441-435
=>6
check
435 +6 = 441
$$\sqrt{441} = 21$$
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