Maths practice for 12-year-olds - page 249 of 347
Number of problems found: 6932
- Material improvement
Material in a factory was originally enough for two workshops for 20 days. After implementing an efficiency improvement, the same material lasted 25 days. How many days will the material last for 5 workshops now? How many extra days of work do the saved m - Train delay
The train should be at the station for 10 minutes. It still has 32 km left. What is the expected delay if the train travels in 2 minutes 3 km except for the last section, 2 km in 5 minutes? - Unknown number
If I reduced the sum of 70 and the unknown number three times, I would get 100. What is the unknown number? - Division with Remainder
What number did we divide by 55 if the ratio is 9.16 and the remainder is 0.04? - Trapezoid construction
Construct an isosceles trapezoid, whose base is 6 cm long, the base forms an angle of 30 ° with the diagonal, and the arms are 4 cm long. - Third pump
The first pump fills the pool in 12 hours. The second pump fills it in 15 hours. If all three pumps work, the pool will fill in 4 hours. How long will it take to fill the pool with only the third pump? - Thunder and lightning
There was a glimpse of the sky, and we heard thunder in 4.5 seconds. The light spreads at 300,000 kilometers per second, so we can assume the flash instantly without delay. However, the sound's speed is much lower in the air, one-third of a kilometer per - Czech flag
Calculate the areas of the colored parts on Czech flag in the shape of a rectangle with dimensions of 2 m and 1 m. White and red form half the width, the blue triangle is isosceles, and its apex is half the length. - Paper harvest
Four boys passed the paper to harvest. John received 111 1/3 ducats, Michael 228 3/4, Peter 195 1/2 ducats, and Robert 146 1/4 ducats. How many kg of paper did each boy bring if they bought paper at 2.50 ducats per kg? - Equation 15 Solve equation with variables on both sides:
- Yogurt calcium
100g of yogurt contains 150mg of calcium. How many kg of yogurt would we have to eat to meet the daily dose of calcium 1000mg? - Average distance
The tourist section covered 14.5 km in 2.5 hours. What distance did he cover on average per hour? - Game Points Win Loss
Philip and Dustin agreed that they would score 20 points for winning five in a row and -10 points for losing. Dustin lost eight times out of 10 games and won twice. How many more points does Philip have? - Chimney covering
How many m² of sheet metal is needed to cover 4 m high chimneys with a rectangular cross-section with 2.5 m and 1.2 m dimensions? Add 1/20 to the folds. - Colored paper
Can a 4 cm, 3 cm, and 2 cm block be glued with a colored quarter of paper measuring 7 cm and 8 cm? - Soil transport
Excavated soil increases the pile's volume by 1/3. Can a 6 m, 2.5 m, and 1.8 m truck body be used to transport excavated soil to a 5 m, 2 m, and 1.5 m block-shaped pool? - Dance participation
The dance group is preparing for a performance. The program includes dances in pairs, fours, and fives. How many members does a group have to have to dance all these dances and have all their members participate in each dance? - On Children's
On Children's Day, the organizers bought 252 pieces of chewing gum, 396 candies, and 108 lollipops. They want to make as many of the same packages as possible. Advise them what to put in each package and how many packages they can make this way. - Hour salary
You work for 4 hours on a Saturday and 8 hours on Sunday. You also receive a $50 bonus. You earn $164. How much did you earn per hour? - Pamela
Lara Pamela spends her salary of 3000 on food, clothing, recreation, and savings, which are in the ratio of 48:20:15:37, respectively. How much does he spend on savings?
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