Advertisements
Advertisements
Question
First guess the answer and then calculate:
37 × 18 = ?
Advertisements
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
What about you? Do you also find Maths difficult?
What is the most difficult thing in your Maths book?
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?
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 22 kg of plastic.
| 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?
First guess the answer and then calculate:
69 × 52 = ?
First guess the answer and then calculate:
77 × 55 = ?
First guess the answer and then calculate:
4 × 206 = ?
