Advertisements
Advertisements
Question
First guess the answer and then calculate:
37 × 18 = ?
Solution
Guess = 37 × 18 means 40 x 20 = about 800
Calculation-
| 30 | 7 | |
| 10 | 30 × 10 | 7 × 10 |
| 300 | 70 | |
| 8 | 30 × 8 | 7 × 8 |
| 240 | 56 |
By adding the digits in third and fifth rows you will get
300 + 70 + 240 + 56 = 666
Hence, 37 × 18 = 666.
APPEARS IN
RELATED QUESTIONS
Ask people and find out the cost of a cup of tea-
- At a tea stall-
- At a hotel-
- Have you ever heard of someone taking a? For what?
- How much loan was taken?
- How much money was paid back?
Hariya and Babu want to buy a handcart for Rs 300.
 |
 |
Who has to pay back more - Hariya or Babu?
For 10 rickshaws she will get Rs 20 × 10 = Rs 200.
So, for 9 rickshaws, she will get Rs 200 – _____ = ______.
In a week how much does Kiran earn from one rickshaw?
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/- |
- Kiran bought 1 kg plastic for Rs 10, but sold 1 kg plastic for Rs 12. How much money does she earn on selling 1 kg plastic?
- So, how much money does she earn for 63 kg?
| 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 = ?
