Math practice for 13 year olds - page 353 of 424
Number of problems found: 8476
- Number sum
The sum of the two numbers is 13. The third of the first number is three. What are the numbers? - Price reduction
The washing machine originally cost 450 €, but the shop reduced it by 12%. After the second discount, it cost € 364.32. What percentage did it reduce for the second time? - Pears and cherries
Pears and cherries grow in the orchard. There are a total of 510 trees. Half of all cherries and a quarter of pears are just as many as all cherries. How many pears and how many cherries? - Map distance
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? - Chickens and kittens
There were chickens and kittens in the grandmother's yard. George 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 - Family ages
Dad, mom, and daughter are 100 years old. A father is four times as old as a daughter. Mom is ten years older than half the father and daughter. How old are they? - Chickens and hares
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? - Cheetah vs snail
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? - 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 - Calculate trapezoid
A trapezoid is given: c = 4.2 cm, h = 8 cm, S = 42.4 cm, d = 8.4 It would help if you calculated the following: sides a and b, and perimeter o: - Diagonal length
The square plot has an area of 324 m². Calculate the length of the road that runs diagonally across the plot. - Dice points
Three dice throw a total of 12. Green has two times more than red. Blue is two times less than green. How many points are on each cube? - Two numbers
The sum of two numbers equals 840. The first number makes up 40% of the second number. Specify both numbers. - 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
- Original route
A walker who had covered 2/3 of the planned hiking route discovered that he had lost his map. He came back for her. After overcoming 1/4 of the route he had already traveled, he found the map. He then continued in his original direction. When he had walke - 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
Milo and George are a total of 56 years old. Milo is eight years younger than George. 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? - Work commitment
The student worked 27 hours, fulfilling three-fifths of his commitment. How many more hours should he work to fulfill his promise? How many hours should he work to meet his 120% commitment?
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