Maths practice for 12-year-olds - page 207 of 348
Number of problems found: 6951
- Six percents
6% of the base is 21. How much is 28% of this base? - Initial price
The price of the T-shirt was initially 379 CZK, but it was reduced by 16%. How much does it cost now? - Determine 8115
The number of blue and green candies is 5:6. and The number of red and green candies is 3:8. Determine the ratio of red and blue candies. - Reducing 8114
By reducing the unknown number by 342, you get 81% of the unknown number. Find this number. - Received 8112
Matej, Simon, and Peter shared a profit in the ratio of 3:4:5. How much did they win in total if Matej received CZK 1,520? - The sponsor The school received money from the sponsor. She used one-third to buy computers and half of the rest to adjust the gym. It still has 4000 euros left. How many euros did the sponsor donate to the school?
- Prism 4 sides
Find the surface area and volume of a four-sided prism high 10 cm if its base is a rectangle measuring 8 cm and 1.2 dm. - Milan's 8103
Peter and Milan let go of the kites. Peter's kite flew to 8m 35dm 16cm. Milan's kite flew 60cm lower. To what height did Milan's kite fly? - Determined 8095
Jeníček weighed a broken piece of brick and found that it weighed 48 grams. Using a measuring cylinder, he determined its volume at 30 cm³. What is the density of the brick? - Predetermined 8094
Lumberjacks cut down a predetermined number of trees over the course of three days. On the first day, they cut down a quarter of the trees; on the second day, they cut down 6 more trees than on the first day; on the third day, they cut down 6 more trees t - Together 8086
The first tiler would cover the inside of the pool in 5 working days, and the second would need seven working days for the same work. In how many days would they line the inside of the pool together? - Calculated 8085
Roza calculated that if she read ten pages a day, she would read the whole book in 18 days. After a week, however, she decided to read one more page a day. How many days will he read the entire book? - Diameter of cent coins
In what proportion are the diameters of these coins: 10 cents-diameter 19.75mm 20 cents-diameter 22.25mm 50 cents-diameter 24.25mm - Meeting 8082
George makes steps 60 cm long. He will take 1530 steps on the way to school. How many steps will his father take to the class meeting if he makes steps 85 cm long? - Minutes 8081
I will drain the whole tub in 4 minutes. How long would it take to drain it if I added two more drain holes? - Distance 8080
The driver covered the distance between the two cities in 2 hours at an average 75 km/h speed. How did he change speed to get 20 minutes faster? - Cleaning the pool
The swimming pool is 25 m long, 12 m wide, and 2 m deep. The walls and bottom of the pool require regular cleaning. The company that cleans the pool charges CZK 50 per 1 square meter. How much does the owner pay for cleaning the pool? - The King
The King wants to divide his sons equally. He has 42 rubies and 45 diamonds. How many sons and how will they share them? - Four workers
Four workers lay on the gym floor for six hours. After an hour of working together, one of the workers went to the doctor. How long will it take for the remaining three workers to complete their work? - Twenty-four 8069
Twenty-four combers combed the hop garden in 6.5 days. How many combers would have to work on combing the hop garden in 5 days?
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