Name: 平方根技巧｜#aumsum (Square Root Tricks | #aumsum)
Uploaded: 2021-01-14T08:10:35.000Z
Duration: 7 min 1 s
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情態助動詞 B1

For finding square root of complete squares, we must memorize the squares of numbers 1 to 9.

Squares of 1 and 9 have 1 in the units place.

Squares of 2 and 8 have 4 in the units place.

Squares of 3 and 7 have 9 in the units place.

Squares of 4 and 6 have 6 in the units place.

Divide the given number into two groups such that.

7 helps us to find the tens place digit of the square root.

Square root of smaller number 4, that is, 2 is the tens place digit of the square root.

The remaining group, that is, 84 helps us to find the units place digit of the square root.

For units place digit of the square root, there are two possibilities, 2 and 8.

Multiply the tens place digit of the square root, that is, 2 by its successor 3.

Now, 4 into 5 is equal to 20 and 18 is less than 20.

Therefore, smaller of the two, that is, 3 is the units place digit.

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平方根技巧｜#aumsum (Square Root Tricks | #aumsum)

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