Unit conversion - practice for 14 year olds
Number of problems found: 571
- Minutes 6069
How many minutes is 60% of two hours? - Kilograms 23581
How many kilograms is 24% of 30 tons? - The silver
The silver ring weighs 10 grams. The ring contains 850 per mille of pure silver. Calculate the amount of pure silver in grams. - Resistance
A resistor having an electrical resistance of 1.5 k ohms passes an electrical current of 0.1 A. Calculate the voltage between the terminals of the resistor. - Kilometers 7415
The Earth's distance from the moon is 3,844.10 to the eighth meter. How many kilometers is it? - Map scale
On a map, on a scale of 1:50000, what is the distance in kilometers that 6 cm on the map represents? - Permille of alcohol
I have 2 per mille of alcohol in my blood. How many milliliters is it when I have 5 liters of blood? - Bulb
A 60 W bulb consumes 0.12 kWh of electricity. How long did she stand light without a break? - Average 41841
What work do we do if we pull out a 58mm nail with an average force of 350N? - Two municipalities
The horizontal distance between municipalities is 39 km. The average sinking is 7 per mille. What is the difference in height between these municipalities? - Manganin
How long must a manganin wire with a diameter of 0.8 mm have a value of 10Ω? - Weight fraction
To prepare the brine, we need 1500 g of an aqueous salt solution with a weight fraction of 0.08. What salt weight and water volume do we need to prepare it? - Uranium ore
Uranium ore contains 0.2% pure uranium, and pure uranium includes 0.07% fissile uranium. How many grams of fissile uranium has 2800 ton of uranium ore? - Yesterday 79344
Petr played Minecraft for 2 hours yesterday. Pavel played 10% longer. How many minutes did Pavel play? - Marked 43771
The pool is 50 m long and 20 m wide. How will it be marked on the plan on a scale of 1:200? - Preparation 3992
4 per mille of active ingredient is needed per 6 liters of water to prepare sprays. How many milliliters of active substance do we add to the sprays? - Mains voltage
How much electric current flows through the appliance with a resistance of 40kΩ, connected to the mains voltage (230 V)? - The train
The train passed the observer in the 20s and passed through a 1500m tunnel in 2 minutes. Calculate the speed (km/h) and train length. - Grass
Peter and Stano lawn grass for 3 hours 12 minutes. How long would it take for Peter if Stano lawn grasses himself for 384 minutes? - Work
Workers work five days a week and have 28 days of vacation a year. Calculate how many days is out of work and express it as a percentage. Consider that a year has 52 weeks.
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