Maths practice for 12-year-olds - page 304 of 354
Number of problems found: 7075
- Number property
Which number has the property that if we subtract from its five times increased by five and its three times reduced by 3, we get the original number again? - Iron cast
What is the weight of cast iron with a volume of 3575 cubic centimeters? The density of the cast iron is 7600 kg/m3 - On the number line
What number is exactly in the middle between 9.8 and -2.4 on the number line? - Dripping tap
In one day, 168 liters of water flow out of a dripping water tap. How many days will 4.2 cubic meters of water flow out? - Wall tiling
The tiler covered 3/5 of the wall with tiles in two hours and 45 minutes. How long did it take to complete the entire lining area at the same power? How long did the whole job take him? - House plans
The owner of the house received two different plans for the new building. One with a scale of 1:100, followed by the builders, and the other with a scale of 1:25, according to which he will finish the interior. In the first plan, his living room was 7 cm - Barrel volume
If we pour one-fifth and then another 50 liters from the barrel, two-thirds of the original volume will remain in the barrel. What is the volume of the barrel? - Martin and Pavol
Twelve years ago, Martin was three times older than Pavol. Now, Martin is twice as old as Pavol. How old is Martin now, and how old is Pavol? - Cash registers
When eight cash registers are open in the grocery store, customers wait for an average of 12 minutes. What will the waiting time be if the other two cash registers open? - Age difference
Milan and Juraj are a total of 56 years old. Milan is eight years younger than Juraj. Please find out how old each of them is. - Horse distribution
The king distributed his horses to the three sons in a ratio of 7:6:4. The eldest son received 63 horses, the most of all the brothers. How many horses did the king share with his sons? - Excavator
The excavator bucket capacity is 0.5 m³. Determine the mass of sand that the excavator picks up. The sand density is 1700 kg/m³. - Plum basket
There were plums in the basket. They doubled their number and then took 8 plums. They doubled the number of plums left in the basket again and took 8 plums. They doubled the number once more and took 8 plums. Then, there was no plum left in the basket. Ho - Chocolate box
Peter ate one-sixth of the candy from the box of chocolates, and ten candies increased him. How many candies did Peter's box of chocolates have? - Forest cleanup
A group of nature conservationists (a total of 28 members) and a sports team (16 members) worked for 7 days to clean up the forest park with an area of 10 ha. How many days would conservationists have to work without the help of athletes? - Petrol tank
The petrol tank is filled to three-quarters of its volume. After running out of 875 liters of gasoline, it was filled to only two-fifths of the volume. How many liters does a full tank have? - Cake and lemonade
Three cakes and two lemonades cost € 3 and 21 cents. Three cakes and three lemonades cost € 3 and 99 cents. How many cents does one cake cost, and how much does one lemonade cost? - Plot dimensions
Calculate the actual proportions of the rectangular plot in meters, which has dimensions of 70 mm and 90 mm, on a 1:2000 scale plan. - Football tickets
Adam was at some of his favorite football team's home games last season. Sometimes, he bought a seat ticket for €9, sometimes a standing ticket for €5. He spent a total of €76. How many times did Adam buy a seat ticket, and how many times did he buy a sta - Honor students
In the classroom, 60% of students have good academic results. 20% of them are honored. What percentage of students in the class are honored?
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