Number and Number Sense, Scientific Notation, Add, Subtract, Multiply and Divide, Math worksheet for Grade 8 at myTestBook.com

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Question 1
5.67 × 10 ⁷ + 7.34 × 10 ⁷ = ?
A.	13.0 × 10 ⁸	B.	13.01 × 10 ¹⁴
C.	1.301 × 10 ⁸	D.	1.301 × 10 ⁷

Question 2
8.548 × 10 ¹⁵ − 2.224 × 10 ¹⁵ = ?
A.	6.324 × 10 ¹⁵	B.	5.324 × 10 ¹⁵
C.	6,324 × 10 ¹⁴	D.	6.024 × 10 ⁰

Question 3
(4 × 10 ⁴) × (2 × 10 ³) = ?
A.	8 × 10 ⁷	B.	6 × 10 ⁷
C.	8 × 10 ¹²	D.	8 × 10 ¹

Question 4
(6 × 10 ⁵) ÷ (2 × 10 ²) = ?
A.	8 × 10 ⁵	B.	3 × 10 ¹⁰
C.	3 × 10 ^2.5	D.	3 × 10 ³

Question 5
2.55 × 10 ⁷ + 50,000,000 = ?
A.	7.55 × 10 ⁷	B.	3.05 × 10 ⁷
C.	2.555 × 10 ⁷	D.	2.60 × 10 ⁷

Question 6
2.55 × 10 ⁷ − 10,000,000 = ?
A.	2.551 × 10 ⁷	B.	1.55 × 10 ⁷
C.	2.54 × 10 ⁷	D.	2.45 × 10 ⁷

Question 7
(4 × 10 ⁴) × 1,000 = ?
A.	4 × 10 ⁷	B.	400 × 10 ⁷
C.	4 × 10 ⁸	D.	4 × 10 ⁶

Question 8
(8.4 × 10 ⁸) ÷ 10,000 = ?
A.	8.0 × 10 ⁸	B.	4.4 × 10 ⁸
C.	8.4 × 10 ⁴	D.	8.4 × 10 ²

Question 9
Weight of the Earth is 5.9736 × 10 ²⁴ Kg. Mass of the Venus is 4.8685 × 10 ²⁴ Kg. What is the combined weight of the Earth and Venus?
A.	10.8421 × 10 ²⁶ Kg	B.	10.8421 × 10 ²³ Kg
C.	1.08421 × 10 ²⁵ Kg	D.	10.8421 × 10 ²⁵ Kg

Question 10
Planet Venus is 1.08 × 10 ⁸ Km away from the Sun and Planet Mercury is 5.79 × 10 ⁷ Km from the Sun. How much farther away is the planet Venus from the Sun as compared to the planet Mercury?
A.	6.21 × 10 ⁷ Km	B.	5.01 × 10 ⁸ Km
C.	5.10 × 10 ⁷ Km	D.	5.01 × 10 ⁷ Km

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Question No Answer
1 C
2 A
3 A
4 D
5 A
6 B
7 A
8 C
9 C
10 D

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