Numbers like
25 and 81 are perfect squares because their square roots are whole numbers 
. But there are many other numbers that are not perfect
squares.
Notice what
happens when you find 
with a calculator.
Numbers like are not integers or rational numbers because
their decimal values do not terminate or repeat. They are irrational numbers. You
can estimate irrational square roots by using perfect squares.
Estimate
each square root to the nearest whole number.
Alternative Solutions:
List some perfect squares to find the two perfect squares
closest to 22.
Since 22 is closer to 25 than to 16, the best whole number estimate for 
is 5.
Alternative Solutions:
Since 130 is closer to 121 than to 144,
the best whole number estimate for 
is 11.
Gardening
Link
3. A
box of fertilizer covers 250 square feet of garden. Find the length in whole
feet of the largest square garden that can be fertilized with one box of
fertilizer.
Alternative Solutions:
Find the largest perfect
square that is less than 250. Then find its square root.
The square root of 225 is 15.
Therefore, the largest square garden that can be fertilized with one box of
fertilizer has a length of 15 feet.
Sumber
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