SChand Composite Mathematics Class 7 Chapter 5 Exponents & Powers Exercise 5C

  Exercise 5C

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Q1 | Ex-5C |Class 7 | Exponents & Powers | S.Chand |Composite Mathematics |Chapter 5 |myhelper

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Question 1

Is the number written is scientific notation ? Write yes or no 

 

(i)  $24 \times 10^{7}$ 

Ans: No 

(ii) $7 \times 10^{4}$

Ans: Yes

(iii) $8.9 \times 5^{2}$ 

Ans: No

(iv) $0.3 \times 10^{6}$

Ans No

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Q2 | Ex-5C |Class 7 | Exponents & Powers | S.Chand |Composite Mathematics |Chapter 5 |myhelper

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Question 2

Complete

(i) $54,000,000$ 

Sol:  $5.4 \times 10^7$

 

(ii) $980,000,000,000$ 

Sol: $9.8 \times 10^11$

(iii) $50,000,000,000,000$

Sol: $5 \times 10^13$

(iv) $2740,0,000,000$ 

Sol: $2.74 \times 10^{10}$

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Q3 | Ex-5C |Class 7 | Exponents & Powers | S.Chand |Composite Mathematics |Chapter 5 |myhelper

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Question 3

Write in scientific notation:

(i)  72,000

Sol:  $7.2 \times 10^{4}$

(ii)8000000

Sol: $8 \times 10^{6}$

(iii) $790,000,000$ 

Sol:  $=7.9 \times 10^{8}$

(iv) $8,040,000,000$ 

Sol: $8.04 \times 10^{9}$

(v) 31,408,000,000

Sol: $3.1408 \times 10^{10}$

(vi) Saturn is about 1,600,000,000 km from the earth 

Ans: $1.6 \times 10^{9}$

 

(vii) Large distances are also measured in light year. One light year is about 9,460,000,000,000 km. It is the distance light travels in a year 

Ans: $9.46 \times 10^{12} \mathrm{~km}$