 # Ncert Solutions for Exponents Class 8 maths Chapter 12 CBSE Part 2

In this page we have NCERT book Solutions for Class 8th Maths:Exponents and Power Chapter 12 for EXERCISE 2 . Hope you like them and do not forget to like , social share and comment at the end of the page.
Question 1
Express the following numbers in standard form.
1. 0.0000000000085
2. 0.00000000000942
3. 6020000000000000
4. 0.00000000837
5. 31860000000

1. 0.0000000000085 =8.5 ×10-12
2. 0.00000000000942 =9.42×10-12
3. 6020000000000000 =6.02×1015
4. 0.00000000837 =8.37 ×10-9
5. 31860000000 =3.186×1010
Question 2
Express the following numbers in usual form.
1. 3.02 x 10-6
2. 4.5 x 104
3. 3 x 10-8
4. 1.0001 x 109
5. 5.8 x 1012
6. 3.61492 x 106

1. 3.02 x 10-6 = .00000302
2. 4.5 x 104 =45000
3. 3 x 10-8 =.00000003
4. 1.0001 x 109 =1000100000
5. 5.8 x 1012 =5800000000000
6. 3.61492 x 106
=3614920

Question 3
Express the number appearing in the following statements in standard form.
(i) 1 micron is equal to 1/1000000 m.
(ii) Charge of an electron is 0.000, 000, 000, 000, 000, 000, 16 coulomb.
(iii) Size of bacteria is 0.0000005 m
(iv)  Size of a plant cell is 0.00001275 m
(v) Thickness of a thick paper is 0.07 mm

1. 1/1000000
=1×10-6
2. 0.000, 000, 000, 000, 000, 000, 16
=1.6 ×10-19
3. 0.0000005
=5 ×10-7
4.  0.00001275
=1.275 ×10-5
5.     0.07
=7×10-2
Question 4
In a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?

Total thickness
=5×20  + 5X.016
=100  + 5× 1.6 ×10-2
=100  + .08
=100.08 mm

Reference Books for class 8 Math

Given below are the links of some of the reference books for class 8 Math.

1. Mathematics Foundation Course for JEE/Olympiad : Class 8 This book can take students maths skills further. Only buy if child is interested in Olympiad/JEE foundation courses.
2. Mathematics for Class 8 by R S Aggarwal Detailed Mathematics book to clear basics and concepts. I would say it is a must have book for class 8 student.
3. Pearson Foundation Series (IIT -JEE / NEET) Physics, Chemistry, Maths & Biology for Class 8 (Main Books) | PCMB Combo : These set of books could help your child if he aims to get extra knowledge of science and maths. These would be helpful if child wants to prepare for competitive exams like JEE/NEET. Only buy if you can provide help to the child while studying.
4. Reasoning Olympiad Workbook - Class 8 :- Reasoning helps sharpen the mind of child. I would recommend students practicing reasoning even though they are not appearing for Olympiad.

You can use above books for extra knowledge and practicing different questions.

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