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प्रश्न
Running Exercise
The doctor has told Devi Prasad to run 2 km every day to stay fit. He took one round of this field. How far did he run?
The field was very far from his home. So he chose a park nearby. The boundary of the park was about 400 metres long.
- How many rounds of the park must Devi Prasad run to complete 2 km?
- One day the weather was very good and a cool breeze was blowing. He felt so good that he kept jogging till he got tired after 8 rounds. That day he ran ____ km and ____ metres!
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उत्तर
Devi Prasad ran one round the field
= 500 m + 500 m + 500 m + 500 m
= 2000 m
= 2000 ÷ 1000 km
= 2 km
(1) 2 km = 2 × 1000 m
= 2000 m
So to complete 2000 m, Devi Prasad must complete
= 2000 m ÷ 400 m
= 5 rounds
Devi Prasad has to run 5 rounds of the park.
(b) Devi Prasad covers a distance in 8 rounds = 400 m × 8
= 3200 m
= 3000 m + 200 m ...(3000 m = 3000 ÷ 1000 = 3 km)
= 3 km 200 m
That every day he ran 3 km and 200 m.
APPEARS IN
संबंधित प्रश्न
- Guess the distance between any two dots. How many centimetres is it? Now measure it with the help of a scale. Did you guess right?
- Which two dots do you think are farthest from each other? Check your answer.
- Which two dots are nearest to each other? Check your answer.
Try This.
Draw another hair of double the length.
Imagine-
- Could that person pass through the door of your classroom without bending?
- Will his head touch the roof of your house if he stands straight?
Guess and Find Out
If a handkerchief is made out of a single thread, how long would that thread be?
How high can a plane fly? Can it fly higher than Mount Everest which is about 9 km high?
How many pots can be placed to reach the tree branch?
The matchstick is 4 centimetres long.
The die is 1 centimetre from every side.
The lizard is 13 centimetres long.
- The leaf is ______ centimetres long.
- The wax colour is ______ centimetres long.
- Now, look at a scale that you find in a geometry box. How many centimetres does it have? ______
Which is longer? Thumb or little finger?
Compare your measurement with your friends.
- Who has the biggest head and who has the smallest head?
- Who has the longest hand (from middle finger to wrist)?
- Which is longer? Your ear or your nose?
- Is any of your nails more than 1 centimetre long?
Activity 1
- Find some things that look 1 metre long.
- Use your metre-rope to find which of these things are more or less than 1 metre.
| Name of the thing | More than 1 metre | Less than 1 metre |
| Length of table | - | - |
| Width of table | - | - |
| Width of door | - | - |
| Length of door | - | - |
| - | - | |
| - | - | |
| - | - |
