Sail E0 Webinar

5th Grade > Mathematics

INTRODUCTION TO NUMBERS MCQs

Total Questions : 40 | Page 1 of 4 pages
Question 1. The product of a three digit number and a four-digit number cannot have more than ______ digits.
 
  1.    8
  2.    5
  3.    7
  4.    12
 Discuss Question
Answer: Option C. -> 7
:
C
The product of largest 3 digit number and 4 digit number 999×9999=9989001
So the product of anythree-digitnumber and a four-digit numbercannot have more than 7 digits.
Question 2. Which of the following set of numbers are arranged in descending order?
  1.    XLV, XXII, LI, XI
  2.    LXI, XLIV, XXXVIII, XXV
  3.    XXXVIII, XLIX, LII, LXIV
  4.    X, XI
 Discuss Question
Answer: Option B. -> LXI, XLIV, XXXVIII, XXV
:
B
For theset of Roman numerals X, XI the values are:
X = 10
XI = 11
10 < 11.
So, they are not arranged in descending order.
For theset of Roman numeralsXLV, XXII, LI, XI:
XLV = 45 and LI = 51.
45 < 51.
Therefore the set of Roman numeralsXLV, XXII, LI, XI are not arranged in descending order.
For theset of Roman numeralsXXXVIII, XLIX, LII, LXIV:
LII = 52 and LXIV = 64.
52 < 64
Therefore the set of Roman numeralsXXXVIII, XLIX, LII, LXIV are not in descending order.
For theset of Roman numerals LXI, XLIV, XXXVIII, XXV the values are:
LXI = 50 + 10 + 1 = 61
XLIV = 40 + 4 = 44
XXXVIII = 10 + 10 + 10 + 5 + 3 =38
XXV = 10 + 10 + 5 = 25
Since, 61, 44, 38, 25 are in descending order soLXI, XLIV, XXXVIII, XXV are arranged in descending order.
Question 3. What is the product of the successor and predecessor of the largest 2 digit number?
  1.    198
  2.    9800
  3.    199
  4.    9900
 Discuss Question
Answer: Option B. -> 9800
:
B
The largest 2 digit number = 99
To find the successor of a number, we add 1 to it.
99 + 1 = 100
The successor of 99 = 100
To find the predecessor of a number we subtract 1 from the given number.
99 - 1 = 98
Predecessor of 99 = 98
Product = 98×100=9800
Question 4. Find the sum XLI + XII
  1.    53
  2.    50
  3.    52
  4.    63
 Discuss Question
Answer: Option A. -> 53
:
A
XL = 50 - 10 = 40
( If a symbol of smaller value is written to the left of a symbol of greater value, then its value is subtracted from the symbol of greater value.)
XLI = 40 + 1 = 41
( If a symbol of smaller value is written to the right of a symbol of greater value, then its value gets added to the symbol of greater value.)
XII = 12
XLI + XII = 41 + 12 = 53
Question 5. What are the symbols which are never repeated in the Roman numeral system?
  1.    X, C, L
  2.    C, D, M
  3.    V, L, D
  4.    V, C, I
 Discuss Question
Answer: Option C. -> V, L, D
:
C
V, L, D are never repeated in the Roman numeral system.
For example,
We write 102 as 'CII'. We can't write it as 'LLII'.
Question 6. In Roman numerals 'X' can be subtracted only from  _____ and _____.
  1.    I, V
  2.    L, C
  3.    L, D
  4.    I, L
 Discuss Question
Answer: Option B. -> L, C
:
B
In the Roman numeral system, 'X' can be subtracted from L and C only. (L= 50) and (C= 100) For example:
XL = 50 - 10 = 40
XC = 100 -10 = 90
We can not write XD or XM.
Question 7. CMXLV is equal to ____.
  1.    495
  2.    965
  3.    945
  4.    445
 Discuss Question
Answer: Option C. -> 945
:
C
CM = 900
XL = 40
V = 5
CM XL V
900 + 40 + 5 = 945
Therefore CMXLV = 945.
Question 8. Round off the numbers 677 and 833 to the nearest hundred and find their product.
  1.    150000
  2.    480000
  3.    15000
  4.    560000
 Discuss Question
Answer: Option D. -> 560000
:
D
To round off a number to the nearest 100 we check the last two digits of the number.
If thisnumber is 50 or more, we round up the number to the higher value (nearest higher multiple of 100).
If this number is less than 50, we round down the number to the lower value.( nearest lower multiple of 100)
For 677, 70 > 50. So it is rounded off to 700.
For 833, 30 < 50. So it is rounded off to 800.
Round Off The Numbers 677 And 833 To The Nearest Hundred And...
So, the given numbers are rounded to 700 and 800.
Product = 700×800
= 560000
Question 9. The place value and face value of a digit in a number, are always equal at the 
 
  1.    Ones place
  2.    Tens place
  3.    Hundreds place
  4.    Thousands place
 Discuss Question
Answer: Option A. -> Ones place
:
A
The place value and the face value of a digit in a numberare always equal at the ones/units place.
For example in 987,
H T O
9 8 7
The face value of 8 = 8
The place value of 8 = 80
The face vlaue of 9 = 9
The place value of 9 = 900
But, The face vlaue of 7 = 7
The place value of 7 = 7
Question 10. The smallest 7 digit number using the digits 4, 0, 1, 7, 6 without repeating 0 is :
  1.    1104476
  2.    1011467
  3.    1110467
  4.    1104467
 Discuss Question
Answer: Option B. -> 1011467
:
B
To find the smallest number wefirst arrange the given digits in ascending order.
0 < 1 < 4 < 6 < 7
Since we cannotwrite a number starting with '0' we have to write it in 2nd position.
So our required order will be 1, 0, 4, 6, 7.
We have to make the smallest 7 digit number using the given digits, so we need 2 more digits.
To make the smallest 7 digit number we will use 1, which is the 2nd smallest digit ( we have to make the number without repeating 0).
So the smallest 7 digit number using the digits 4, 0, 1, 7, 6 without repeating 0 is1011467.

Latest Videos

Latest Test Papers