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## Number System Basics: Test-4

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Question 1 |

What will be the answer when the number 4567.893 is rounded to the nearest unit digit?

4567.9 | |

4567.84 | |

4567 | |

4568 |

Question 1 Explanation:

We need to round the number to the closest unit digit.

After the decimal, we have 8 (greater than 5),

therefore we round off the number to the next number.

In case we have the number 4567.893, we have selected 4568 as the answer.

After the decimal, we have 8 (greater than 5),

therefore we round off the number to the next number.

In case we have the number 4567.893, we have selected 4568 as the answer.

Question 2 |

Which number is 1,347 when rounded to the nearest hundred?

1300 | |

1340 | |

1400 | |

1350 |

Question 2 Explanation:

Since the number is smaller than 1350 so cannot be approximated to the next hundred-value.

Thus, the best option and the right answer is 1300.

Thus, the best option and the right answer is 1300.

Question 3 |

Which of these an irrational number?

0 | |

-2 | |

âˆš3 | |

0.86 |

Question 3 Explanation:

Irrational numbers are those which are not rational, that is those numbers that cannot be written in the form of a ratio.

0 is neither rational nor irrational number

-2 is a rational number as it can written in the form -2/1

0.86 can be written in the form of 86/100 and therefore is a rational number

So the right answer is c i.e âˆš3 which is equal to 1.7320508075688772935274463415059

and it cannot be written in p/q form

0 is neither rational nor irrational number

-2 is a rational number as it can written in the form -2/1

0.86 can be written in the form of 86/100 and therefore is a rational number

So the right answer is c i.e âˆš3 which is equal to 1.7320508075688772935274463415059

and it cannot be written in p/q form

Question 4 |

Which is the expanded notation for the number 0.675?

6 x 10 ^{-3} + 7 x 10^{-2} + 5 x 10^{1Â } | |

6 x 10 ^{-4} + 7 x 10^{-2} + 5 x 10^{0} | |

6 x 10 ^{-1} + 7 x 10^{-2} + 5 x 10^{-3} | |

6 x 10 ^{3} + 7 x 10^{-2} + 5 x 10^{1} |

Question 4 Explanation:

The right answer is c

6 x 10

When we solve this equation, we get the right answer as:

6 x 1/10 + 7 x 1/100 + 5 x 1/1000= 0.675

6 x 10

^{-1}+ 7 x 10^{-2}+ 5 x 10^{-3 }When we solve this equation, we get the right answer as:

6 x 1/10 + 7 x 1/100 + 5 x 1/1000= 0.675

Question 5 |

Which is the standard number for 4 x 10

^{5 }+ 3 x 10^{-3}+ 2 x 10^{2}+ 5 x 10^{1}?400250.003 | |

400250.0003 | |

40250.03 | |

400250.300 |

Question 5 Explanation:

The right answer is option a

The clue for this question is the negative power of 10

When we will solve this we find the answer option a as the right answer

The clue for this question is the negative power of 10

When we will solve this we find the answer option a as the right answer

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