Quiz about Numbers And Operations

Question 1

A scientist estimates that there are $$2.2 	imes 10^{7}$$ walleye in Lake Erie. The total volume of Lake Erie is $$4.83 	imes 10^{11}$$ cubic meters. A pool with a volume of $$200,000$$ cubic meters is built to model the lake.
How many walleye should be put into the pool to model the conditions in the lake?

Accepted Answer

Covalent bond

Answer

$$4.39 	imes 10^{9}$$

Answer

$$8.6 	imes 10^{10}$$

Answer

$$8.6 $$

Answer

$$1.96 	imes 10^{8}$$

Question 2

Which expression is equivalent to $$0.00007 ?$$

Accepted Answer

Covalent bond

Answer

$$7 	imes 10^{-5}$$

Answer

$$7 	imes 10^{-4}$$

Answer

$$7 	imes 10^{4}$$

Answer

$$7 	imes 10^{5}$$

Question 3

A company surveys $$200$$ shoppers to find out what type of bottled water they prefer. The partial two-way table shown gives the results of the survey as relative frequencies.

What is the missing value in the table?

![](http://admin.getprephub.com/media/editor/Screenshot%202023-04-26%20at%201.51.26%20PM_20230426115136143706.png)

Accepted Answer

Covalent bond

Answer

$$0.45$$

Answer

$$0.12$$

Answer

$$0.54$$

Answer

$$0.19$$

Question 4

The table shows the cost per year of attending different types of colleges.
![](http://admin.getprephub.com/media/editor/Screenshot%202023-06-12%20at%209.49.14%20AM_20230612074929147433.png)
A student is planning to attend college in 5 years. The student has saved $$1,200$$ dollars and plans to save another $$50$$ dollars per month over the next 60 months.
Based on this information about the student's plan, which statement about the possible choices for a college is true?

Accepted Answer

Covalent bond

Answer

J The student would be able to afford in-state costs for one year at a public 2-year college.

Answer

F The student would be able to afford the costs for one year at a private 4-year college.

Answer

G The student would be able to afford out-of-state costs for half a year at a 4-year public college.

Answer

H The student would be able to afford in-state costs for half a year at a public 4-year college.

Question 5

Approximate the value of $$\sqrt{23}$$ and place it on the number line.

![](http://admin.getprephub.com/media/editor/Screenshot%202023-04-26%20at%203.04.35%20PM_20230426130722182651.png)

Accepted Answer

Covalent bond

Answer

![](http://admin.getprephub.com/media/editor/Screenshot%202023-04-26%20at%203.04.55%20PM_20230426130740922178.png)

Answer

![](http://admin.getprephub.com/media/editor/Screenshot%202023-04-26%20at%203.05.13%20PM_20230426130840475114.png)

Answer

![](http://admin.getprephub.com/media/editor/Screenshot%202023-04-26%20at%203.50.32%20PM_20230426135043672590.png)

Answer

None of the above

Numbers And Operations Class 8 Maths Problems and Solutions

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