Maths practice for 12-year-olds - page 306 of 355
Number of problems found: 7081
- Digit count
How many numbers from 0 to 999 contain at least one digit, 5? - Average points
Fifty students took a math test. The average number of points was 68. The top 10 students scored 100 points. What is the average number of points for the remaining 40 students? - December salary
The official had a monthly salary of 8,500 euros. During the year, they increased his salary by 15%, so he received a total of 112,200 euros for a year. From which month did they raise his salary? (1 = January .... 12 = December) - Bus passengers
There were a lot of people standing at the bus stop in the morning. Three-eighths of them got on the first bus, one-fourth on the second, and the remaining 9 on the third. How many people were at the stop from the beginning? - Board cost
The school paid CZK 25,400 for five identical boards and two printers for a computer. Calculate how much one board costs if one printer's price is 4500 CZK. - Lemonade bottles
Three glasses are to be filled with lemonade. One can hold a quarter of a liter, the second a third of a liter, and the third 0.4 liters. How many 0.33l bottles will we need, and how much lemonade will be left in the last bottle? Express in fractions. - Freezer
The freezer has the shape of a cuboid with internal dimensions of 12 cm, 10 cm, and 30 cm. A layer of ice 23 mm thick was formed on the freezer's inner walls (and on the opening). How many liters of water will drain if we dispose of the freezer? - Wood cuboid
What is the weight of the wood cuboid 15 cm, 20 cm, and 3 m if 1 m³ wood weighs 800 kg? - Rainwater tank
The garden tank for rainwater is cuboid in shape, the bottom of which is square, with a side 150 cm long and 80 cm high. How many 15-liter buckets do we need to drain the water from the tank? - Zoo tickets
One children's ticket to the zoo costs €3. One ticket for an adult costs €6. Aunt Katka and Uncle Jano went to the zoo with the children. Uncle Jano paid for all the tickets at the box office. Aunt Katka then gave him €15 for herself and all the girls. Ho - Board cutting
Cutting a wooden board into five parts takes 20 minutes. All slices are the same length. How long would it take to cut into eight pieces if we still cut at the same speed? - Birthday
Brano received money from his uncle for his birthday. When he went to the store, he counted out loud: "If I buy chocolates for 1 euro and 30 cents each, I will have 60 cents left. But if I wanted to buy the same amount of chocolates for 1 euro and 40 cent - Mug and kettle
Aunt bought 6 identical mugs and one coffee pot. She paid €60 in total. A teapot was more expensive than one mug but cheaper than two mugs. Auntie remembered that all the prices were in whole euros. How much € was one mug, and how much was a kettle? - Farm summerjob
The company employed a student on the farm for the entire month of June (including weekends). They paid him € 16 for one day and an all-day meal. If he did not work any day, he paid € 6 for food. How many days did the student work when he earned € 348 in - Rink entrance
There were 60 people at the rink, four-fifths of which were children under 15 years of age. A ticket for children under 15 costs €1 and for adults €2. a) How many children were there at the rink? b) How many adults were there? c) How many euros did they c - Aircraft dimensions
The model aircraft is made on a scale of 1:250. Length is 200mm, wingspan 200mm. Find the dimensions of the actual aircraft. - Workers
Four workers plan to work on the gym floor for six hours. After an hour of working together, one of the workers went to the doctor. How long will it take the remaining three workers to finish the job? - Octopus tentacles
Both octopuses have 112 tentacles. The pink octopus has 20 tentacles less than the yellow. How many tentacles does a pink squid have, and how many tentacles does a yellow squid have? - By dosing
A dairy uses a new and an old line to dose yogurts. By dosing yogurts on the old line, the order is fulfilled in 6 hours. If both lines work together, they will fulfill the same order in 2 hours. How many hours will it take to fulfill such an order if the - Diploma writing
Martina helped the coach write diplomas. It took her 3 minutes to write her first diploma and her next 2 minutes. How many minutes will it take her to write n = 14 diplomas/including the first/if she works at this pace?
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