Maths practice for 12-year-olds - page 301 of 362
Number of problems found: 7225
- Consecutive numbers
The sum of four consecutive odd numbers is 240. What are the numbers? - Two-thirds 3030
Peter is a 5th-grade student. He collects stickers. He has two-thirds of them in the album, a quarter is ready for exchange, and he wants to give eight stickers to his friends. How many stickers does Peter have? - Kilometers 3029
The car consumed m liters of gasoline per s of kilometers. How many liters of gasoline does it consume per 100 km? - Webshop 3027
The webshop reduced the price of the suit by p percent. What was the new cost of the suit? - Hotel
The hotel has a p floor each floor has i rooms from which the third are single, and the others are double. Find the number of beds in the hotel. - Granddaughter 3022
Grandpa was pulling beets. The balance of forces of the participants was as follows: Grandfather : grandmother : granddaughter : dog : cat : mouse = 8:5:3:2.5:2:0.2. How many grandfathers would it take to pull out the beets? How many mice would be needed? - Points
Gryffindor won 437 points. How many points were obtained by each of the faculties if they were split at a ratio of 5:7:3:4?
- Rainfall
How many liters of water fell in a 32m long and 8m wide garden if 8mm of rain fell? - Pupils at cinema
Alena bought movie tickets for two groups of pupils. The first group purchased seven tickets for 1st and five for 2nd place, and she paid 62Kč. The second group bought 11 tickets for 1st and four for 2nd place and paid 82Kč. How much was the ticket for 1s - Calculate 3016
Calculate the height of the cylinder based on its surface S and the radius of the base r. a) r = 2 cm, S = 120 cm square b) r = 7 dm, S = 4,000 dm square c) r = 0.2 m, S = 20 square meters - Thickness 3015
The copper sheet metal has a thickness of 3 mm, is 0.9 meters long, and is 75 hundred meters wide. How many kilos does it weigh if one dm³ copper weighs 8.8kg? - Measuring 3014
How much does a gold bar measuring 5cm, 10cm and 3cm, and 1 cm³ gold weigh 19.3 g? - Determine 3013
An unknown number increased by 300% equals 62. Determine an unknown number. - Conva
How many liters of water fit into the shape of a cylinder with a bottom diameter of 20 cm and a height of 45 cm? - Excavate 3008
The well will have a diameter of 2 m and a depth of 7 m. How many cubic meters of soil are needed to excavate a well?
- Insulation
Two workers insulate the house for five days. After the first day of working together, only one worker continue to cover the house. How many days will the house be insulated if every worker has the same work tempo? - Solve
Solve this direct relation by the triplet: 0.25h. .. . . .. .. . . .. .. .. 3 pcs 6.5h. .. . . .. .. . . .. .. . . .. .. x pcs - Bridge piers
One-quarter of the bridge pier is sunk into the ground. Two-thirds are in the water. Protruding above the water is 1.20 m long. Determine the height of bridge piers. - Smallest internal angle
Calculate what size has the smallest internal angle of the triangle if values of angles α:β:γ = 3:4:8 - Rectangular trapezium
Calculate the perimeter of a rectangular trapezium when its area is 576 cm² and side a (base) is 30 cm, height 24 cm.
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