Advertisements
Advertisements
Question
First guess the answer and then calculate:
2 × 175 = ?
Solution
This number will be near to 2 × 175 = 350
On calculation:
| 100 | 70 | 5 | |
| 2 | 100 × 2 | 70 × 2 | 5 × 2 |
| 200 | 140 | 10 |
By adding numbers in the last row you will get
200 + 140 + 10 = 350.
APPEARS IN
RELATED QUESTIONS
What do you think is the easiest lesson in maths?
Ask people and find out the cost of a cup of tea-
- At a tea stall-
- At a hotel-
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.
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.
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?
First guess the answer and then calculate:
37 × 18 = ?
First guess the answer and then calculate:
142 × 5 = ?
First guess the answer and then calculate:
382 × 3 = ?
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.
