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Class 8
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Maths
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Playing with Numbers
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Numbers in General Form
Numbers in General Form
Revise with Concepts
Generalised Form of a Number
Example
Definitions
Formulaes
Applying the General Form of Numbers
Example
Definitions
Formulaes
Learn with Videos
General form of Numbers
4 mins
Simple Puzzles with Numbers
6 mins
Quick Summary With Stories
General form of a two and three digit numbers
2 mins read
Applications on General Form of Numbers
3 mins read
Important Questions
Some students planned a picnic. The budget for food was
R
s
.
4
8
0
. But eight of these failed to go and thus the cost of food for each member increased by
R
s
.
1
0
. How many students attended the picnic?
Medium
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>
Show that the square of any positive integer cannot be of the form
(
5
q
+
2
)
or
(
5
q
+
3
)
for any integer
q
.
Medium
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>
Show that any positive integer is of the form 3q or, 3q+1 or,3q+2 for some integer q.
Medium
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>
Find the sum :
1
0
−
9
+
1
5
2
2
Medium
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>
Find the number nearest to 110000 but greater than 100000 which is exactly divisible by each of 8,15 and 21.
Hard
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>
Give five examples where the number of things counted would be more than
6
-digit number.
Easy
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>
Find
1
% of
1
hour.
Medium
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>
The sum of digits of a 2-digit number is
1
1
. If the number obtained by reversing the digits is
9
less than the original number, find the number.
Medium
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>
The sum of the digits of a two-digit number is 12. If the new number formed by reversing the digits is greater than the original number by 54, find the original number. Check your solution.
Medium
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>
Read and expand the numbers wherever there are blanks.
Number
Number Name
Expansion
20000
twenty thousand
2
×
1
0
0
0
0
26000
twenty six thousand
2
×
1
0
0
0
0
+
6
×
1
0
0
0
38400
thirty eight thousand four hundred
3
×
1
0
0
0
0
+
8
×
1
0
0
0
+
4
×
1
0
0
65740
sixty five thousand seven hundred forty
6
×
1
0
0
0
0
+
5
×
1
0
0
0
+
7
×
1
0
0
+
4
×
1
0
89324
eighty nine thousand three hundred twenty four
8
×
1
0
0
0
0
+
9
×
1
0
0
0
+
3
×
1
0
0
+
2
×
1
0
+
4
×
1
50000
-----
----
41000
----
----
47300
----
----
57630
----
----
29485
----
----
29085
----
----
20085
----
----
Write five more 5-digit numbers, read them and expand them.
Medium
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>