Exercise 5C
Q1 | Ex-5C |Class 7 | Exponents & Powers | S.Chand |Composite Mathematics |Chapter 5 |myhelper
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
Q2 | Ex-5C |Class 7 | Exponents & Powers | S.Chand |Composite Mathematics |Chapter 5 |myhelper
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: $2.74 \times 10^{10}$
Q3 | Ex-5C |Class 7 | Exponents & Powers | S.Chand |Composite Mathematics |Chapter 5 |myhelper
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: $9.46 \times 10^{12} \mathrm{~km}$
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