Math practice for 13 year olds - page 217 of 428
Number of problems found: 8556
- Column rope length
The column is fixed in a vertical position by 3 ropes, which are caught at the height of 3 m above the ground. The other ends of the ropes are anchored to the ground at a distance of 4 m from the base of the column. How much rope was used to secure the po - Rake tree distance
Emma was raking leaves in the garden. During lunch, she leaned the 170 cm long rake against a tree, with the upper end reaching a height of 90 cm. How far from the tree was the bottom of the rake? Enter the result in whole centimeters. - Aircraft altitude calculation
Radar sees an aircraft at an altitude angle of 15°24', and the direct distance from the radar is 5545 m. At what altitude does the aircraft fly? - Resistor voltage calculation
The resistor has a value of 50 ohms, and a current of 120mA 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
The bases are 9 cm and 50 mm long in a rectangular trapezoid. The length of the shorter arm is 3 cm. Calculate the circuit 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, Eva and Peter, saved a total of 228 CZK. Eva 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 20mA passes through the resistor, which is connected to a voltage of 2.5V. 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-10cm, c-8cm, h-6cm. Calculate the height of the prism - Hydrogen peroxide dilution
I have 1 liter of 9% hydrogen peroxide, making it a 3% solution. How much water do I need to add? - 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?
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