Maths practice for 12-year-olds - page 250 of 351
Number of problems found: 7016
- Grandfather and grandmother
The old mother is five years younger than the old father. Together, they are 153 years old. How many years has each of them? - Two trains
There were 159 freight wagons at the railway station creating two trains. One had 15 more wagons than the other. How many wagons did each train have? - Cross-section 5721
Calculate how much electric current flows through the circuit if a 3 C (C is SI unit - Coulombs) electric charge passes through the conductor cross-section in 30 seconds. - Electrical 5720
The bulb is connected to a 4.5 V power supply. An electric current of 45 mA flows through the filament of the bulb. The calculated size of the electrical field of the filament lamp - Electrical 5719
A resistor with an electrical resistance of 1.5 kiloohms passes through an electrical current of 0.1 amps. Calculate the electrical voltage between the resistor terminals - Coil as a girl
The electrical resistance of the copper wire coil is 2.0 ohms. What current runs through the coil when the voltage between the terminals is 3.0 V? - Coulombs How long does it take for a 15 C charge to cross the conductor's cross-section if a 3mA current passes through the conductor?
- Resistance of the resistor
The resistor terminals have a voltage of 20 V, and a current of 5 mA is passed through. What is the resistance of the resistor? - Pupil age
I am a primary school pupil, and I spent 1/4 of my age on parents' exercise with children, 1/3 on drawing, and 1/6 on flute. I did not have a ring for the first three years of my life and never went to two rings at once. How old am I? - Dividing - fractions
11/4, what will we divide to get 11/12? - Train and walker
Walker passes an hour 5 km. Express train per hour 100 km. Walker went for 4 hours. How many minutes did the distance express train? - Savings
Eva lent 1/3 of her savings to her brother, 1/2 of her savings spent in the store, and 7 euros left. How much did she save? - Compared 5703
In the 223 matches, the teams scored 1174 goals, of which home teams scored 638. From the duels played so far, the home team won 127 times. How many more goals have the home team scored in the duels played so far compared to the visitors? - Grandmother 5695
Franta spent 4 sixths of the money he got from his grandmother on a cassette with songs. With the help of a neighbor, he earned 2 sevenths of the amount he received from his grandmother. Express as a fraction what part of the money from his grandmother wa - Four-ninths of pupils
Pupils at school choose a circle. A third of them chose athletics, four-ninths of the pupils chose ceramics, and the remaining 12 pupils chose floorball. How many pupils are there in the school? How many signed up for individual circles? - Rainfall
A rectangular garden of 25m in length and width 20m in width is filled with 4mm of water. Express by a fraction in basic form what part of the 60-hectolitre tank we would fill with this water. - Manufacturing 5686
If you know that the company produces four similar products that differ only in the weight of the packaging, determine the final price of the product in terms of costs. The total cost of manufacturing the product was CZK 5,745,000. And 10 kg 15,000 pcs B - Parallelogram 5685
Calculate the height of the parallelogram, which has an area of 2.31 square meters and a side of 15.4 cm. - Numbers 5677
The first number is 50% of the second, the second number is 40% of the third, and the third number is 20% of the fourth. The sum is 396. What are the numbers? - Determine 5673
An airplane flew from city A to city B at a speed of 500 km/h. Fifteen minutes later, an airplane took off from city B to city A at a speed of 450 km/h. After 45 minutes, the planes met. Determine the distance between A and B.
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