Maths practice for 12-year-olds - page 193 of 347
Number of problems found: 6923
- Wax candles
A company makes wax candles in the shape of a cylinder. Each candle has a diameter of 4 inches and a height of 7 inches. If the company used 7561.12 in³ of wax, how many candles did it make? Use 3.14, and do not round your answer. - Height of the cylinder
The cylinder volume is 150 dm cubic. The base diameter is 100 cm. What is the height of the cylinder? - Container with water
The cube-shaped container is filled with water to half its height. If we add 20 liters of water, the company will fill the container to three-quarters of its height. What is the volume of the whole container? - ATM withdrawal calculation
The ATM had 33250 euros on Monday. 10/25 was withdrawn from it on Tuesday, and 2/5 was withdrawn from the same ATM on Wednesday. How many did they pick on Tuesday, and how many on Wednesday? How many euros remained in the ATM? - Ball shot calculation
How many ball shots with diameters of 2 mm can be made of 1 kg of special metal alloy with a density of r = 7550 kg/m³? - Father and daughter
A father is 36 years old, and his daughter is 20 years younger. What will be the ratio of their ages when each is ten years older? - Ages
The father is 36 years old, and his daughter is four years old. Write down the ratio of the age of the father and daughter. In what ratio will the ages of father and daughter be after four years? - Age ratio Janko is 14 years old. The age ratio of Janka and Zuzka is 2:3. What was the ratio seven years ago?
- Sprinter speed calculation
The sprinter ran 101 meters in 10 seconds. At what speed in km/h did he run? - Sum of the edges
The sum of the lengths of all cube edges is 72 cm. How many cm² of colored paper are we going to use for sticking? - Parallerogram
The ABCD parallelogram is a = 2.5 cm, height to side a is 7.2 cm and height to side b is 4 cm. Find the side length b. - Rate 3
A liquid is heated at a rate of 5 degrees Celsius per minute. If the temperature now is at 39 degrees Celsius, how long will the temperature be by 94 degrees Celsius? - Average speed
The average speed of a pedestrian who walked 10 km was 5 km/h, and the average speed of a cyclist on the same track was 20 km/h. In how many minutes did the route take more than a cyclist? - Expression unknown calculation
The expression 2n + m = 52, please express an unknown n. - Volume of the cone
Find the volume of the cone with the base radius r and the height v. a) r = 6 cm, v = 8 cm b) r = 0,9 m, v = 2,3 m c) r = 1,4 dm, v = 30 dm - Office painting cost
Our office has dimensions of 5 m by 4.5 m and a height of 2.5 m. How much will it cost to paint it if a liter of paint costs €3.50 (yield 10 m²/l) and the painter asks €1.20 for the job and 1 m² painting? It will need to be painted twice. - Fiona Shrek meeting
Fiona sets off from the tower after Shrek at 9:10 at a speed of 6 km/h. Shrek starts to meet her from the swamp at 9:50 at a speed of 4 km/h. At 10:50, they meet and return back to the swamp at a speed of 4 km/h. What time does he arrive at the swamp? - Aquarium water calculation
The aquarium has the dimensions a = 250 cm, b = 50 cm, and c = 60 cm. Water is poured into the aquarium up to 45 cm. Do you calculate how many liters of water are in the aquarium? - Calculate
Calculate the surface of a regular quadrilateral prism whose base edge is 2.4dm and the height of the prism is 38cm. - The prison ball
Calculate the density of the material from which the prison ball is made if you know its diameter is 15 cm and its weight is approximately 2.3 kg. With the help of mathematical-physicochemical tables, estimate what material the ball is made from.
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