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 do you think is the easiest lesson in maths?
Hariya and Babu want to buy a handcart for Rs 300.
 |
 |
Who has to pay back more - Hariya or Babu?
How Much does Kiran Earn from 9 Rickshaws in a Day?
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/- |
How much will Kiran pay for 42 kg newspaper?
| 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:
77 × 55 = ?
First guess the answer and then calculate:
382 × 3 = ?
First guess the answer and then calculate:
2 × 175 = ?
First guess the answer and then calculate:
4 × 206 = ?
