Math practice for 13 year olds - page 216 of 415
Number of problems found: 8281
- Resistor voltage calculation
The resistor has a value of 50 ohms, and a current of 120 mA passes through it. What is the voltage across the resistor? - Average speed
The average speed of a good cyclist is 30 km/h. The average speed of the less able is 20 km/h. They both set off on the same route at the same time. A good cyclist drove it 2 hours earlier. How long was the route? - Trapezoid circuit area
A right-angled trapezoid has parallel sides of 9 cm and 50 mm, and the shorter leg is 3 cm long. Calculate the perimeter and area. - Penalty daily
John was to pay CZK 1,500. If he does not pay on time, he will be charged a penalty of 0.5 permille of the amount owed for each day of delay. He will remember in 30 days. How much is the penalty? - Bus people distribution
There are 39 people on the bus. There are 11 more adults than children. How many children are on the bus, and how many adults? - Sibling savings calculation
Two siblings, Eve and Peter, saved a total of 228 CZK. Eve saved three times more than Peter. How much did each of them save? - Mushroom drying calculation
When dried, mushrooms lose 80% of their weight. How many fresh mushrooms do we need to get half a kilogram of dried ones? - Unknown number percentage
The number 290 is 16% larger than the unknown number. What's the unknown number? - Resistor resistance calculation A current of 20 mA passes through the resistor, which is connected to a voltage of 2.5 V. What is the resistance of the resistor?
- A lot of hay
Martin's grandfather weighed a lot of hay and calculated that it would last 100 days for 15 rabbits. How many days will this lot be enough for 25 rabbits? - Snack
The teacher paid CZK 450 for a snack for 30 pupils. How many CZK will we pay for the same snack for 28 pupils? - Granite cube buoyancy
The granite cube with an edge length of 1 dm and a weight of 2.5 kg is immersed in a container with water. How much buoyancy makes it lighter? How much compressive force does the cube exert on the bottom of the container? - Prism height calculation
The 4-sided prism has a volume of 648 cubic cm. The trapezoid, its base, has the dimensions a-10 cm, c-8 cm, h-6 cm. Calculate the height of the prism - Land area calculation
On the map, at a scale of 1:400 m and an area of 100 cm². How much are you interested in this land? - Rectangle area comparison
The rectangle has 10 and 8 cm dimensions on a 1:10 scale plan. How many times does it have more area than on the plan? - Corridor plastering time
According to the standard, we calculated that two masons would plaster the corridor of the new school building in 54 hours. How long would it take for nine bricklayers to plaster this corridor? - The bakery
The bakery delivered 60 kg of bread to the store. The bread weighed 1 kg and 2 kg, a total of 35 pieces. How many loaves weighed 1 kg, and how many were two-kilo loaves? - Coal supply duration
With the consumption of 0.4 t of coal per day, the supply lasts for 36 days. How many days will the supply be enough if 16 kg of coal is used less daily? - Apple drying calculation
Last year, Mirek's aunt dried 4.8 kg of fallen apples from 30 kilograms of fallen apples. He wants to dry the crosses from 50 kilograms of apples this year. Approximately how many kg will he gain? - Backpack color distribution
They have two types of backpacks in the store. Blue is for 160 CZK, and red is for 180 CZK. They have 24 backpacks with a total value of CZK 4,120. How many blue and red backpacks do they have?
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