SAMACHEER KALVI - 8th Maths -CHAPTER 1 & 2 - NUMBERS & MEASUREMENTS- IMPORTANT 2 Marks and 5 Marks

 

 MATHS-I PAPER      

                                                CHAPTER-1

I. ANSWER ALL THE TEN OF THE FOLLOWING:                10 X 2 = 20

1. Find the square of 1098

2. Find the square root by prime factorisation method 9025

3. Find the square root by long division method 418609

4. Find square root of 

                                    71849

5. Show that 1944 is not a perfect cube.

6. Find the cube root of 729 by prime factorisation.

7. Evaluate (2-1 × 3-1) ÷ 6-1

8. Find the number is standard form: 2.5 × 10-11 

9. Write in scientific notation: 1642.398

10.Expand using exponents:  897.14 

                              CHAPTER-2

II. ANSWER ALL THE TWO OF THE FOLLOWING:                 2X 5 = 10

1. Find the length of the arc, area and perimeter of the sector whose central angle is 45°and radius is 16 cm.

2. A circle of radius 70 cm is divided into 5 equal sectors. Find the area of each of the sectors.

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