Express the following numbers in standard form. (i) 0.0000000000085 (ii) 0.00000000000942 (iii) 6020000000000000 (iv) 0.00000000837 (v) 31860000000

NCERT - Mathematics

Book: NCERT - Mathematics

Chapter: 12. Exponents and Powers

Subject: Maths - Class 8^th

Q. No. 1 of Exercises 12.2

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1

Express the following numbers in standard form.
(i) 0.0000000000085
(ii) 0.00000000000942
(iii) 6020000000000000
(iv) 0.00000000837
(v) 31860000000

(i) 0.0000000000085 = 85 ×10^-13

(ii) 0.00000000000942 = 942 ×10^-14 = 9.42 ×10^-12

(iii) 6020000000000000 = 602 ×10¹³ = 6.02 ×10¹⁵

(iv) 0.00000000837 = 837 × 10^-11

(v) 31860000000 =3186 × 10⁷= 3.186 ×10¹⁰

1

Chapter Exercises

Exercises 12.1

Exercises 12.2

1

Express the following numbers in standard form.
(i) 0.0000000000085
(ii) 0.00000000000942
(iii) 6020000000000000
(iv) 0.00000000837
(v) 31860000000

2

Express the following numbers in usual form.
(i)

(ii)

(iii)

(iv)

(v)

(vi)

3

Express the number appearing in the following statements in standard form.
(i) 1 micron is equal to
(ii) Charge of an electron is 0.000,000,000,000,000,000,16 coulomb.
(iii) Size of a 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

4

In a stack there are 5 books each of thickness 20mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack.