1. Knowing Our Numbers Worksheet With Answers Page 9
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25<
Solution:
Sale during the first week of August =
3,85,891
<
Sale during the second week of August =
4,00,768
3,85,891
<
Total sale for the two weeks together
+
4,00,768
<
<
<
=
3,85,891 +
4,00,768
7,86,659
<
<
=
7,86,659
<
Therefore, the sale for two weeks together =
7,86,659
The extreme left digit of the number representing sales of the
second week is greater than that of the first week. Therefore,
4,00,768
<
the sale in the second week is greater.
–
3,85,891
<
In the second week, the sale is greater by
14,877
<
<
<
=
4,00,768 –
3,85,891
<
=
14,877
Example 14: Find the difference between the greatest and the least number that can be formed
using the digits 8, 2, 7, 4, 3 with each digit coming only once.
Solution:
The greatest number which can be formed using the digits 8, 2, 7, 4 and 3 with each
occurring only once is 87,432.
The smallest number which can be formed using the digits 8, 2, 7, 4 and 3 with each
occurring only once is 23,478.
87,432
The difference between the greatest and smallest numbers so formed
– 23,478
= 87,432 – 23,478 = 63,954
63,954
Therefore, the difference between the greatest and
smallest numbers using the digits 8, 2, 7, 4, 3 = 63,954
Example 15: A machine, on an average, manufactures 3,215 screws a day. How many screws did
it produce in the month of January 2009?
3,215
Solution:
Average number of screws manufactured in a day = 3,215
×
31
Number of days in the month of January = 31
3,215
Number of screws produced in the month of January 2009
+ 9,645
X
= 3,215 × 31
99,665
= 99,665
Therefore, the number of screws produced in the month of January 2009 = 99,665
<
Example 16: A merchant had
88,592 with her. She placed an order for purchasing 40 video games
<
at
1,200 each. How much money will remain with her after the purchase?
<
Solution:
Cost of each video game =
1,200
1,200
<
Cost of 40 video games =
1,200 × 40
×
40
<
0000
=
48,000
+ 4,800
X
<
The merchant had
88,592 and she placed an order for
48,000
<
48,000.
Money which will be left with her after the purchase of
88,592
<
<
<
40 video games =
88,592 –
48,000 =
40,592
– 48,000
Therefore, the money left with her after the purchase
40,592
<
of 40 video games =
40,592
9
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