Maths practice for 12-year-olds - page 305 of 362
Number of problems found: 7227
- Grandfather 2871
Dasha asked her grandfather, a good accountant, how old he was. He said: If you add 5 to my number of years and divide this sum by six, you will get the same result as subtracting 6 from my number of years and dividing this difference by five. How old is - Increased 2870
Mathias had a certain amount of money in the winning book. He won, and his stake increased by 100%. Mathias used half the money for a trip and donated what he won to his brother Jakub. How much is left in his passbook? - One-fifth 2869
Find all natural numbers that are twice as much as one-fifth plus nine. How many are there? - Performances 2867
Primary schools in one city received a total of 450 tickets for theatrical performances. The primary school on Košická Street received one-third of all tickets and class VII. And she got two-fifteen tickets. How many tickets to the theater performance did - Ice floe
What is the volume of an ice floe weighing 326 kg? - Kilometer 2864
One cubic decimeter of seawater contains 0.000 000 01 grams of gold. How many kilograms of gold is in one cubic kilometer of seawater? - Sunbathed 2861
There were more than 40 and less than 80 children by the pond. A fifth of the children took a bath, and a seventh sunbathed. How many children were at the pond?
- Determine 2860
Five natural numbers are given, each of which is a triple of the previous one. The largest number is bigger by 1152 than the middle number in this series. From these five numbers, determine the first number. - Denominator 2858
Which same integer must we add to the reader and the denominator of the fraction 37/73 so that the fraction equals one-half? - Obtained 2855
50% of pulp is obtained from wood and 60% from paper. How much wood is needed to make 100 tons of paper? - Shipwrecked 2854
The naval ship had 150 people on board and food supplies for 60 days. The captain took on board 30 shipwrecked sailors. For how many days do they have food supplies? - Millimeters 2851
On a 1:10,000 scale map, two cities are 8.5 cm apart. What distance in millimeters will these cities have on a 1:25,000 scale map? - Grandmother's 2850
There were chickens and kittens in the grandmother's yard. Juraj found that if she added one more kitten, the number of kittens and chickens would be the same. But if she added five chickens to the original number, the kittens and chickens would have the - Grandmother 2848
Old mom keeps chickens and hares. He has five times more hens than hares. Boris calculated that all animals have a total of 210 feet. How many hares and how many hens does my grandmother have? - Yesterday 2846
Erik read one-fifth of the book yesterday. Today he read one-sixth of the book. He has 38 pages to read. How many pages does the whole book have?
- Two-fifths 2845
David goes to school by bike and says: "If I go 300 meters further than two-fifths of the way to school, I have just walked one kilometer of the way." How far is David from home to school? - Millimeter 2844
The fastest animal in the world is the cheetah, which reaches a speed of 34 meters per second. One of the slowest animals is the snail, which travels at 1/2 millimeters per second. How many times is a cheetah faster than a snail? - Increased 2843
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?
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