Advertisements
Advertisements
Question
First guess the answer and then calculate:
142 × 5 = ?
Advertisements
Solution
On guessing 142 × 5
The number will be near to 140 × 5 = 700
On calculation-
| 100 | 40 | 2 | |
| 5 | 100 × 5 | 40 × 5 | 2 × 5 |
| 500 | 200 | 10 |
By adding the numbers in the last row you will get
500 + 200 + 10 = 710
Hence, 142 × 5 = 710
APPEARS IN
RELATED QUESTIONS
What do you think is the easiest lesson in maths?
If a person who runs a tea stall earns Rs 30 a day, how much will he earn in 10 days? And in a month? How did you get the answer? Discuss.
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 23 kg of waste paper.
I bought 1 kg newspaper for Rs 5, but sold it for Rs 6. How much money did I earn by selling 152 kg of a newspaper?
How much money will Dinu pay for 4 kg brass?
First guess the answer and then calculate:
45 × 24 = ?
First guess the answer and then calculate:
69 × 52 = ?
First guess the answer and then calculate:
2 × 175 = ?
First guess the answer and then calculate:
4 × 206 = ?
