# Free Introduction to Numbers 01 Practice Test - 4th Grade

The greatest 4-digit number that can be formed using 7, 6, 0 and 5 without repeating the digits is  ____.

A. 6570
B. 7560
C. 7650
D. 7065

#### SOLUTION

Solution : C

To find the greatest number that can be created from the given digits, we need to arrange the digits in descending order.

In this case, we have 7 > 6 > 5 > 0.

Thus, the greatest number that can be formed from the given digits is 7650.

If one represents 1, then write the number represented by the diagram: A. 3420
B. 3240
C. 3402
D. 3042

#### SOLUTION

Solution : C

Given that
One cube represents one.
Now, there are 3 cubes in thousands = 3000
There are 4 cubes in hundreds = 400
There are no cubes in tens.
There are two cubes in ones = 2
Hence, the number represented by the diagram = 3000 + 400 + 2 = 3402

In the Roman Numeral system, the symbol for zero is 0.

A. True
B. False

#### SOLUTION

Solution : B

In the Roman Numeral system, the symbol for zero does not exist.

30982 when rounded off to the nearest hundred will be   _____.

A. 30000
B. 30800
C. 30900
D. 31000

#### SOLUTION

Solution : D

To round off a number to the nearest hundred, we check the last two digits of the number.

If the last two digits form a number less than 50, we round down the number to the nearest lower multiple of 100.

If the last two digits form 50 or more than 50, we round up the number to the nearest higher multiple of 100.

To round off 30982 to the nearest hundred, our options are either 30900 or 31000.

Since 82 is greater than 50, 30982 is rounded off to 31000.

The symbol for 500 in roman numerals is .

#### SOLUTION

Solution :

The symbol for 500 in roman numerals is D.

Find the missing number. A. 20
B. 23
C. 21
D. 22

#### SOLUTION

Solution : D

If we look carefully, the pattern is:
4-2 = 2
7-4 = 3
11 -7 = 4
16 - 11 = 5

Thus, the differences between the consecutive members of the pattern themselves form a pattern - 2, 3, 4 and 5.

Thus, the next member of the pattern would be obtained by adding 6 to the previous member, 16.

16 + 6 = 22

Thus, the missing number is 22.

Choose the correct statements.

(There can be more than one correct answer!)

A.

The predecessor of 7899 is 7900

B.

The successor of 9879 is 9880

C.

The successor of 1230 is 1229

D.

The predecessor of 2589 is 2588

#### SOLUTION

Solution : B and D

The predecessor of a number is one less than the number.
The successor of a number is one more than the number.

The successor of 9879 is 9879 + 1 = 9880.
The predecessor of 2589 is 2589 - 1 = 2588.
The predecessor of 7899 is 7899 - 1 = 7998.
The successor of 1230 is 1230 + 1 = 1231.

Hence options B and D are correct.

The largest 6 digit even number is ___

A. 999998
B. 999999
C. 999997
D. 999996

#### SOLUTION

Solution : A

The largest 6 digit even number is 999998. Numbers that end with 0, 2, 4, 6 and 8 are called even numbers.
999998 > 999996.

The length of River Ganga is 3255 km. When rounded off to the nearest hundred, its length will be:

A. 3250 km
B. 3260 km
C. 3200 km
D. 3300 km

#### SOLUTION

Solution : D

When we round off a number to the nearest 100, we check the last two digits of the number. If the last two digits form a number less than 50, we round down the number to the nearest lower multiple of 100. If the last two digits form 50 or more than 50, we round up the number to the nearest higher multiple of 100.
Since the number 3255 has to be rounded off to the nearest hundred, our options are 3200 or 3300. 55 > 50.
Hence the length of River Ganga when rounded off to the nearest hundred will be 3300 km.

Meera has to write a three-digit number on the blackboard: Which of the following digits could she place in the gap to make it the largest number out of the given options?

A. 0
B. 5
C. 9
D. 8

#### SOLUTION

Solution : C

From the digits given, the numbers that Meera has in her hand are 508, 558, 598 and 588.

NumberNumber of tens5080558559895888

Greater the number of tens, greater the number.

Thus, the largest number from 508, 558, 598 and 588 is 598.

Thus, Meera has to choose the digit 9 to get the largest number from the given options.