Class 7 Maths
Question 1: Write the following numbers in the expanded forms:
(a) 279404
Answer: `2 xx 10^5 + 7 xx 10^4 + 9 xx 10^3 + 4 xx 10^2 + 4 xx 10^0`
(b) 3006194
Answer: `3 xx 10^6 + 6 xx 10^3 + 1 xx 10^2 + 9 xx 10^1 + 4 xx 10^0`
(c) 2806196
Answer: `2 xx 10^6 + 8 xx 10^5 + 6 xx 10^3 + 1 xx 10^2 + 9 xx 10^1 + 6 xx 10^0`
(d) 120719
Answer: `1 xx 10^5 + 2 xx 10^4 + 7 xx 10^2 + 1 xx 10^1 + 9 xx 10^0`
(e) 20068
Answer: `2 xx 10^4 + 6 xx 10^1 + 8 xx 10^0`
Question 2: Find the number from each of the following expanded forms:
Answer: (a) 86040, (b) 405302, (c) 30730
Question 3: Express the following numbers in standard form:
(a) 5,00,00,000
Answer: `5 xx 10^7`
(b) 70,00,000
Answer: `7 xx 10^6`
(c) 3,18,65,00,000
Answer: `3.1865 xx 10^9`
(d) 3,90,878
Answer: `3.90878 xx 10^5`
(e) 39087.8
Answer: `3.90878 xx 10^4`
(f) 3908.78
Answer: `3.90878 xx 10^3`
Question 4: Express the number appearing in the following statements in standard form:
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