Unit conversion - practice for 13 year olds - page 5 of 44
Number of problems found: 871
- Resistance
Determine the bulb's resistance with the current 200 mA and is in a regular lamp (230V). - Drunk man
The drunk man has 2.6‰ of alcohol in his blood. How many grams of alcohol has in his blood if he has 5 kg of blood? - Huddersfield 70164
Prague's direct distance to Huddersfield (United Kingdom) is 1680km. What is the map's scale, at which this distance is 84 cm? - Fertilizer 68694
0.6 l of fertilizer goes to 40 l of water. How much fertilizer should be put in per 10 liters of water?
- Output 47613
Pump with an output of 3/8 hl of water in 1 min. How long does it take to fill a 3/4 cubic meter tank with water? - Consumption 44071
Calculate the electric motor's power if it works for 10 minutes, and the electricity meter measured the consumption of 500 Wh. - Material 3986
There are 1.2 per mille of gold in the rock. How many grams of gold will they get from 45 tons of raw material? - Identical 3518
The carpenter cut two identical pieces into shelves from a 2-meter longboard. He cut the rest into four side shelves of 20 cm. How long are the shelves? - Three-hectolitre 3136
Workers rolled the oil into 115 two-liter and three-liter cans from a full three-hectolitre barrel. How many cans were there?
- Two cities
On a map, 1.5 cm represents 50 miles. If the distance between the two cities on the map is 6 cm, how many miles separate the towns? - Deceleration
In a braking test, a vehicle that travels at 51 km/h stops in 5 s. What is its acceleration? - Motorcycle engine
The motorcycle engine has a constant power of 1.2 kW for 0.5 hours. How much work does the engine do? Express work in kWh and Ws units. - Three pumps together
One pump fills the tank in 1.5 hours, the second in 2 hours, and the third in 3 hours 20 minutes. How many minutes will the tank fill with three pumps if they work simultaneously? - Summerjob
Temporary workers Franta ties a sheaf of hay in 20 minutes, Lojza only a quarter in the same time. How many sheaves do they tie together in 8 hours?
- Passenger car
A passenger car covers 1 km in 2/3 minutes, and a truck in 50 seconds longer. How much slower is the speed of the truck? - Buckets 71944
The bucket is filled with one tap in 4 minutes and the other in 3 minutes. In how many hours will five buckets be filled with both cocks? - Dimensions 44361
On mill paper, the dimensions are 11 * 7.5 mm, and the external dimensions of the sauna are 4.4 * 3 m. On what scale is the plan drawn on graph paper? - Apprentice 20753
The trained worker will do the work in 4 hours. The apprentice needs 6 hours for the same work. How many hours and minutes would they do this work if they worked together? - Successively 2380
The car drove successively 2.5x105 m, 1.4x107 mm, 8.6x107 dm, and finally 3x106 cm. What is the total mileage?
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Unit conversion practice problems. Maths practice for 13 year olds.