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प्रश्न
First guess the answer and then calculate:
77 × 55 = ?
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उत्तर
On guessing 77 × 55
The numbers will be near to 80 × 50 = 4000
Calculation:
| 70 | 7 | |
| 50 | 70 × 50 | 7 × 50 |
| 3500 | 350 | |
| 2 | 70 × 5 | 7 × 5 |
| 350 | 35 |
By adding the numbers in third and fifth rows you will get
3500 + 350 + 350 + 35 = 4235
Hence, 77 × 55 = 4235.
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संबंधित प्रश्न
What about you? Do you also find Maths difficult?
Ask people and find out the cost of a cup of tea-
- At a tea stall-
- At a hotel-
In a week how much does Kiran earn from one rickshaw?
Do it mentally and write the answers.
| 2 × 6 = ______ | 4 × 80 = ______ |
| 20 × 6 = ______ | 4 × 81 = ______ |
| 2 × 60 = ______ | 9 × 25 = ______ |
| 3 × 42 = ______ | 31 × 9 = ______ |
Kiran has bought some junk from junk collectors.
Look at the rate list to see today's rates. Help Kiran to find out the cost of the junk.
| Rate-List | |
| Kind of Junk | Price of 1 kg |
| 1. Waste Paper... | Rs. 4/- |
| 2. Newspaper... | Rs. 5/- |
| 3. Iron... | Rs. 12/- |
| 4. Brass... | Rs. 170/- |
| 5. Plastic... | Rs. 10/- |
Find the cost of 12 kg of iron.
| Dinu's Rate-List | |
| Kind of Junk | Price of 1 Kg |
| 1. Newspaper... | Rs. 6/- |
| 2. Iron... | Rs. 14/- |
| 3. Brass... | Rs. 180/- |
| 4. Plastic... | Rs. 12/- |
| 5. Water paper... | Rs. 4.50/- |
How much money will Dinu pay for 32 kg iron?
First guess the answer and then calculate:
45 × 24 = ?
First guess the answer and then calculate:
382 × 3 = ?
First guess the answer and then calculate:
2 × 175 = ?
Kiran paid Rs. 919 to the junk collectors. When she sold the junk she got these notes and coins from Dinu.
Now you make a record in her diary.
Find out how much she earned this time.
