Examples

Chapter 6 Class 8 Squares and Square Roots
Serial order wise

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### Transcript

Example 13 Find the square root of 12.25.Rough 64 × 4 = 256 65 × 5 = 325 Therefore, Square root of 12.25 = 3.5 Individual Steps are explained Step 1: Write the number We make pairs from right. For numbers before decimal point, we start from right and make pairs So, 12 is a pair For numbers after decimal point, we start from the right of decimal point and make pairs So, 25 is a pair Step 2: Now we find that number whose square is less than or equal to 12. 2 × 2 = 4 3 × 3 = 9 4 × 4 = 16 Since 16 > 12, we use 3 × 3. So writing 3 on left side & top. & 9 below 12 Now we find remainder, 12 − 9 = 3 Step 3: Since next is decimal point We put a decimal point on top Step 4 Pair 25 comes down So, our number is now 325 Step 5 We multiply the number above by 2 & add a blank after it So, we write 3 × 2 = 6 6 _ Step 6 Find a number which is less than Or equal to 325 63 × 3 = 189 64 × 4 = 256 65 × 5 = 325 Since 65 × 5 = 325. We use that Thus, Square root of 12.25 = 3.5

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#### Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.