Number Sense

Number Sense

Grade 4

Formation of Numbers
Comparison of Number

Ordering Numbers

Estimation in Nearest Ten’s, Hundread’s,

Thousand’s

Formation of Numbers

Greatest and

Smallest Numbers

Formation of Numbers without Repetition

The greatest and the smallest 5-digit number that can be

formed from the digits 7, 1, 6, 3 and 2 without repetition are

Greatest Number : 76321

(digits arranged in
descending order)

Smallest Number : 12367

(digits arranged in
ascending order)

Dropdown

The largest 4-digit odd number that can be formed by digits 1, 2, 0 and 8 using each digit once is​

Select answer

.

Explanation

We get largest number by arranging the digits in descending order

Largest number formed by the digits 1, 2, 0 and 8 is 8210.

But it is even as 0 is at the ones place.

So, we will interchange the places of 0 and 1 to make it odd.

Hence, the required number is 8201.

Formation of Numbers with Repetition

The greatest and the smallest 5-digit number that can be
formed using the digits 7, 1, 6, 3 and 2 with repetition are

Greatest Number : 77777

(7 repeated five times)

Smallest Number : 11111

(1 repeated five times)

Dropdown

Sumit has five numbered-balls with different digits as shown.

The largest 5-digit number that he can form using these digits is

​

Select answer

Explanation

We get the largest number by arranging the digits in descending order

Here, 9 < 7 < 5 < 4 < 1

So, the largest number formed using digits 4, 1, 5, 7 and 9 is 97541

Other numbers are not larger than 97541.

The number 99754 has been formed with repeated digits so that is not the correct answer even though it is bigger than 97541.

Comparison Of

Numbers

36,233 = 36,233
96,588 > 69,588

E.g:- Comparing
789,999 and 3,456

E.g:- Comparing 9,789,000

and 9,769,000

789,999 > 3,456

9,789,000 > 9,769,000

9,789,000
9,769,000

Comparison

Numbers

When there are unequal

Number of digits

When there are equal

Number of digits

Multiple Choice

Compare

$$\left(743+25\right)$$ ____ $$\left(842-64\right)$$

• >

• <

• =

• Cannot be Determined

Ascending and Descending Order

Numbers are said to be in
ascending order if they are
arranged from the smallest

to the largest number

Example: 54321, 54962,

67433, 67494, 85855

Numbers are said to be in

descending order if they are
arranged from the largest to

the smallest number

Example: 74739, 74708,

71237, 64326, 57854

Ascending and Descending Order

(Mind Map)

213

230

245

277

291

291

277

245

230

213

Multiple Choice

The ascending order of the given numbers:

46673, 4776, 43677, 46337, 43776

is given by?

• 4776, 43677, 43776, 46337, 46673

• 46673, 4776, 43677, 46337, 43776

• 43776, 46673, 4776, 43677, 46337

• 46337, 46673, 4776, 43677, 43776

• None of these

Estimation
of Numbers

●If the number you are rounding is followed
by 5, 6, 7, 8, or 9, round the number up

Example: 38 rounded to the nearest ten is 401

●If the number you are rounding is followed
by 0, 1, 2, 3, or 4, round the number down

Example: 33 rounded to the nearest ten is 30

Rules for Rounding Off Numbers

TTH

TH

H

T

O

1

3

8

2

6

Round to the Nearest

Thousand

Since, 8 > 5

So, 13826 = 14000

Ascending off Number

(Mind Map)

0 1 2 3 4

5 6 7 8 9

0

1

Less than 5

More than 5

Rounding down

Rounding up

9
8
7
6
5

ROUND

THE

NUMBER

UP

4
3
2
1

ROUND

THE

NUMBER

DOWN

WHAT’S THE RULE?

ROUNDING NUMBER

Multiple Choice

The number 4563, when rounded off to the nearest tens, gives

• 4500

• 4600

• 4560

• 4570

Mathematical

Reasoning

Dropdown

The difference between the greatest and the smallest numbers among the given set of numbers: 2187, 1709, 5763, 5907

is ​

Select answer

Multiple Choice

Mishi has five different digits as shown. She wanted to use them to make the 5-digit smallest number. If she put 5 at the hundreds place, what could be the number she made?

• 35697

• 36579

• 36597

• 36759

Drag and Drop

The scores of Kapil, Sachin, Dhoni and Sehwag in 100 matches are 56250, 100745, 89456, 77843. Write the names of player in descending order according to their scores is ​

Placeholder

Drag these tiles and drop them in the correct blank above

Sachin, Dhoni, Sehwag, Kapil

Dhoni, Sachin, Sehwag, Kapil

Dhoni, Sehwag, Kapil, Sachin

Dhoni, Sehwag, Sachin, Kapil

Multiple Choice

Population of town A is 48930 and of town B is 36523. Estimate the populations of the cities to the highest place value.

• A-50000, B-40000

• A-57000, B-45000

• A-40000, B-40000

• A-50000, B-30000