Find the square root of 1089 by using ones and tens digit.
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At ones place the digit is 9. we know that 3² = 9 and 7² = 49, so 3 at the end will give 9 at ones place and 7 at the end will also give 9 at ones place. Therefore in the square root of 2209, at ones place, the number will be either 3 or 7. Now if we leave the two digits from right we get 22
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