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प्रश्न
By re-arranging the given numbers evaluate :
1 + 2 + 3 + 4 + 596 + 597 + 598 + 599
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उत्तर
21 + 22 + 23 + 24 + 25 + 75 + 76 + 77 + 78 + 79
= (21 + 79) + (22 + 78) + (23 + 77) + (24 + 76) + (25 + 75) (by associative law)
= 100 + 100+ 100+ 100 + 100 = 500
Notes
1 + 2 + 3 + 4 + 596 + 597 + 598 + 599
= (1 + 599) + (2 + 598) + (3 + 597) + (4 + 596) (By associative law)
= 600 + 600 + 600 + 600 = 2400
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संबंधित प्रश्न
Fill in the blank:
286 x 1 = ______
State True or False:
The sum of two even numbers is an even number.
State True or False:
Every whole number is a natural number.
State True or False:
Commutativity and associativity are properties of natural numbers and whole numbers both
Solve:
1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
Complete the following magic squares:
| 4 | _______ | 8 |
| _______ | 7 | ________ |
| _______ | _______ | 10 |
See the following pattern carefully:
- If n denotes the number of figures and S denotes the number of matches; find S in terms of n.
- Find how many matches are required to make the :
(1) 15th figure
(2) 40th figure - Write a discretion of the pattern in words.
- In the following pattern, draw the next two figures.
- Construct a table to describe the figures in the above pattern.
- If n denotes the number of figures and L denotes the number of matches, find L in terms of n.
- Find how many matches are required to make the :
(1) 12th figure
(2) 20th figure
Fill in the blank:
0 + 987 = ……….
LCM of 10, 15 and 20 is ______.
