Tag: knowing our numbers

Quizzes (32) Questions (94)

Questions Related to knowing our numbers

Multiple choice maths knowing our numbers indian system of numeration numbers to 1 million numbers in indian and international systems

The least two digit composite number is

  1. $11$
  2. $12$
  3. $10$
  4. $16$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
We know that-If a number has more than $2$ factors then it is a composite number.
$11$ is a prime number $\because$ it has only $2$ factors
$12$ is a composite number $\because$ it has more than $2$ factors
$10$ is a composite number $\because$ it has more than $2$ factors
$16$ is a composite number $\because$ it has more than $2$ factors
$\therefore\,10,12,16$ are composite numbers.
The least composite number is $10$
Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

Roman numeral for the greatest three digit number is

  1. IXIXIX

  2. CMIXIX

  3. CMXCIX

  4. CMIC
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The largest $3$ digit number is $999$. Let's convert that into Roman numerals.

$M = 1000, D = 500, C = 100, X = 10, V = 5$ and $I = 1.$

$900 = CM$

$90 = XC$

$9 = IX$

$900+90+9=999$
$(1000-100)+(100-10)+(10-1)$

Therefore, $999 = CMXCIX$
$(1000-100)+(100-10)+(10-1)$

Let's crossverify,
$CMXCIX=(1000-100)+(100-10)+(10-1)$
$=900+90+9=999$
Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

Numerals that can be repeated in Roman system are 

  1. $I, X \ and\ C$
  2. $I, V \ and\ X$
  3. $V, L\ and\ D$
  4. $D$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As per the rules of writing Roman numbers, Only $I, X, C$, and  $M$  can be repeated; $ V, L$ , and $ D$  cannot be repeated.

Hence, Numerals that can be repeated in Roman system are  $I, X \ and \ C $

Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

X can be subtracted from

  1. $L$ and $ C$
  2. $D$ and $ M$
  3. $D $ only
  4. $M $ only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

While writing Roman Numbers, do not subtract a number from one that is more than  $10$  times greater (that is, you can subtract  $1$  from $10 [IX]$  but not $ 1$  from $ 20$  there is no such number as $ IXX.)$
Hence,$ X (10)$  can be subtracted from $ L (50) \ and \ C (100)$

Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

Write $39$ in roman numbers

  1. XXXIX

  2. XXXXI

  3. XXXX

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
To convert $39$ to Roman Numerals we need to split it up into place values (ones, tens, hundreds, etc.), like this:

Place Value Number Roman Numeral
Tens            $30$ $XXX$
Ones               $9$ $IX$


Please note, we skipped place values that equal 0.

You then combine them all together (starting from the top) to get $XXXIX.$
So option A is the correct answer.

Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

Roman numerals for $498$

  1. CDCXVIII

  2. CDCXIV

  3. CDXCVIII

  4. CDXCVII
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Roman numerals are represented by the following letters:

I = 1

V = 5

X = 10

L = 50

C = 100

D = 500

M = 1000

If a numeral is followed by another numeral of lower denomination, the two are added together;

if it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.

400 + 90 + 8 = CDXCVIII

$CDXCVIII=498$