Math practice for 13 year olds - page 220 of 424

Number of problems found: 8479

Banknotes 17573
The eldest sister saved CZK 7,800 in the bank. She brought this amount only in 100CZK and 200CZK banknotes. The total number of these banknotes was 50. How many banknotes of both values were there?
Circumference 17533
If we enlarge the side of the square by half, its circumference will be 24 cm larger than the original. What is the side of the square?
Negative and postcard
The image on the negative has dimensions of 36x24 mm and is enlarged to a postcard format of 13.5x9 cm. In what proportion have the lengths increased? In what proportion has the image area increased?
One-quarter 17483
The cloth package was stained black: one-third and one-quarter black, the remaining 8 meters gray. How many meters of cloth was in the box?
Calculate 17473
Calculate the length of the oval race track, which has two straights of 100 m, and the diameter of the curves is 52 m.
Discounted 17463
Grandma bought a new apron before Christmas. After Christmas, the store discounted the apron by 46%, so Grandma bought two more of the same apron. In total, she paid 540 crowns for all 3 pieces. How many crowns did the apron cost before Christmas, and how
Roommates 17453
Classmates Tibor and Martin live in the same house. It takes Tibor 20 minutes to get to school, and Martin only 15 minutes. If Martin leaves the house 3 minutes later than Tibor, in how many minutes does he catch up with him?
Two-digit 17443
How many are all even two-digit numbers that We can create from the digits 2, 4, and 7? The numerals can be repeated in the created number.
Observation 17433
The aircraft flying just above point A can be seen from observation B, 2,400 meters away from point A, at an altitude of 52°30'. How high does the plane fly?
Perpendicular line
According to the map, the scouts were supposed to proceed through the forest perpendicular to its straight edge, where the goal was 3 km away from the starting point. They already deviated from the correct direction by 5° at the start. How far from the ta
Semi-skimmed 17403
Mrs. Cermak paid 130 CZK for five boxes of semi-skimmed milk and ten rolls. A box of milk is 17 more expensive than a croissant. Calculate the price of a) 1 box of milk, b) 1 roll.
Two-thirds 17393
In the shop, they sold two-thirds of the bale of fabric and another 7m. They had 4m less than a quarter bales of material left. How many meters of fabric were flooded in the ball?
Subsequent 17323
Four people were paid bonuses, so each subsequent person received half as much as the previous one. How much did everyone receive if the company paid out a total of CZK 6,500?
What percent
What percent of 51 3/5 is 47 2/5?
Establishment 17283
The pupils of 7. A planted raspberry and currant bushes in the establishment of the school garden in the same ratio as the number of girls and boys in their class. How many raspberries and a round of currants did they plant when they planted 14 bushes tog
Czechoslovakia 17233
Slovakia has an area 38% smaller than the Czech Republic. Original Czechoslovakia had an area of 128,000 square kilometers. What are the areas of both states?
Flowerbed 17183
Six pupils will adjust the flower beds on the school grounds in 2 hours. In how many hours will four pupils change the same flowerbed?
According 17163
According to the standard, seven tiles can pave the sidewalk in 12 shifts. After three shifts, one worker went on holiday. In how many shifts were the sidewalk paved?
Parallelogram-shaped 17123
How wide is the parallelogram-shaped garden when its area is 1378 m², and its longer side measures 53 m?
Double-digit 17103
If we can repeat the digits in a number, how many double-digit numbers can we create from the digits 1, 2, 3, 4, 5, and 6?

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