Math practice for 13 year olds - page 50 of 414
Number of problems found: 8262
- Counting Light Cars
There are 96 cars in a car park. There are 24 fewer dark-coloured cars than light-coloured cars. How many light-coloured cars are there in the car park? - A year ago
A year ago, Jano was twice as old as Helen. In five years, Helen will be twice as old as Jano. How old is Helen now? - Ratio 52
The ratio of the surface area of a cube to its volume is 2:1. Calculate: a) the edge length of the cube in cm, b) the volume of the cube in cm³, c) the surface area of the cube in cm². - Princesses
Princesses Anna and Elsa are picking strawberries, which have ripened in huge quantities after a long winter. Anna can pick one bed in 120 minutes, and Elsa is faster and can finish an equally large bed in 15 minutes. How many minutes would it take the ro - MO Z7 2025
Adela and Susan ate plums. On the first day, Adela ate three quarters of what Susan ate that day. On the second day, Susan ate three halves of what Adela ate that day. Together, they ate 31 plums over the two days, and each girl ate a whole number of plum - Finding Original Price
A pair of trousers costs €9.90, which is 90% of the original price. How much did the trousers cost originally? - Heating 2
The heating element of a stove has an electrical resistance of 80 ohms and is connected to a voltage of 230 V. Calculate the electrical energy consumed in a year (365 days) if it is switched on for 2 hours a day. How much will the energy consumed cost if - Tank - fuel prices
I have a car with a 50-litre tank. I want to calculate the weighted average price of a full tank of fuel at the end of the year. In December, 30 litres were filled at 37.50 CZK per litre, and in November, 40 litres at 38.40 CZK per litre. What is the weig - Table - tablecloth
Mrs. Vránová has a square table with a side length of 110 cm. She wants to have a square tablecloth made for it so that each corner extends 25 cm beyond the edge of the table. What dimensions should the tablecloth have? - Six-digit number
Pepina was rolling a dice. The first number that came up, she wrote on a paper, the second she wrote to the right next to the first, the third she wrote to the right next to the second, etc., until after six rolls she had a six-digit number written. a) Wh - Air 2
The air distance between New York and Los Angeles is 3,962 km. How many km does 1 cm on a map represent if the map scale is 1:1,000,000? - Left-handed
There are 100 people in a room, 99% of whom are left-handed. How many left-handed people must leave the room to reduce this proportion to 98%? - Peter 27
Peter earned twice as much as Jano from his part-time job. Jano earned €50 less than Peter. How much did each of them earn? - Irregular
Calculate the area and perimeter of a garden created from a rectangular plot measuring 10 m by 20 m after cutting off one corner measuring 6 m by 7 m. The removed rectangular section has sides parallel to those of the main plot. Did the perimeter of the r - Thinking unknown n
I am thinking of a number. If I subtract 14 from it and multiply the result by 6, I get 210. What is the number? - Spiral - iron
An electric iron is connected to a 230 V power source. Its heating element has an electrical resistance of 100 ohms. Calculate the power of the iron and the electric current flowing through the element. - Tank 28
A tank fills in 120 hours. When drained for irrigation, it empties in 10 days. How long will it take to fill if filling and draining occur simultaneously? - Oranges and apples
Mr. Novák bought 5 times more oranges than apples. One orange cost 8 CZK and one apple cost 12 CZK. He paid 156 CZK in total. How many oranges and apples did he buy? - Asphalt
A tennis court can have a grass, asphalt, or clay surface. A singles court is 23.78 m long and 8.23 m wide. For doubles, a strip 1.37 m wide is added on both longer sides. By how many m² is a doubles tennis court larger than a singles court? - Railing 3
A railing in a museum is filled with 18 glass panels in the shape of parallelograms with a side length of 40 cm and a corresponding height of 65 cm. How many m² of glass were needed to produce these panels?
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