Math practice for 13 year olds - page 253 of 428
Number of problems found: 8557
- Area to perimeter
Calculate the circle circumference if its area is 254.34cm2 - Regular triangular pyramid
Calculate the volume and surface area of the regular triangular pyramid. The height of the pyramid is 12 centimeters. The bottom edge is 4 centimeters, and the height of the sidewall is 12 centimeters. - Quadrangular pyramid
The regular quadrangular pyramid has a base length of 6 cm and a side edge length of 9 centimeters. Calculate its volume and surface area. - Glider Motorplane Chase Time
The glider took off from the airport at 10:00 a.m. and flew to the designated destination 102 km away at a speed of 80 km/h. Half an hour later, a motorplane took off behind him at a speed of 180 km/h. When does the motor plane catch up with the glider, a - Acid evaporation
How many kilograms of water do we have to evaporate from 100 kg of 32% acid to make it 80% concentration? - Hay bags
Four cows eat 16 hay bags in 5 days. How many bags will eat five cows in 7 days? - Car Fuel Consumption Distance
The off-road car will travel 100 km with 10.5 liters. How many km will 116 liters cover? - Father Sons Mowing Time
At six o'clock, the housekeeper will start cutting his bow, which will take 12 hours. Two sons come to help him in an hour, and they will be together in 3 hours. How much would it take for just two sons to mow the bow? - Pudding glass combinations
Petra was preparing a pudding cup to celebrate the holiday. It had four types of pudding, five types of fruit, and two types of decorations. How many different glasses could she prepare with one pudding, one fruit, and one garnish? - Map distance calculation
On a map with a scale of 1:48 000, the distance between cities is 40mm. What is the actual length of cities in km? - Ship port distance
Two ships sailed in the same direction from the two ports simultaneously. The first boat is 20 km/hour, and the second 26 km/hour. The second caught up with the first in 4 hours. What is the distance between ports? - Cars Distance Before Meeting
From cities A and B, two cars drive opposite each other on the same road. The first runs at a constant speed of 80 km/h, and the second at 60 km/h. How far will these cars be a quarter of an hour before the match? - Circumference - increase
If we increase the length of the side of the square by one-third, the circumference of the square will increase by 18 cm. Calculate the length of the side of the square. - Workshop can production
They produced 8,892 cans in the production hall. Their performance is in the ratio 11:12:13. Which workshop was the hardest, and how many cans did it make? - Father and daughter
When I was 11, my father was 35 years old. Now, my father is three times older than me. How old is she? - Pool Fill Drain Time
We filled the pool with two tributaries: the first in 5 hours and the second in 8 hours. The father came and drained 1/8 of the water. How long before the pool fills with both tributaries? - Granules
Katy had two dogs. The first one ate a pack of granules a week, and the other two times longer. Katka bought them two bags of granules. How long does it last for both dogs? - Angle at the apex
In an isosceles triangle, the angle at the apex is 30° greater than the angle at the base. How big are the internal angles? - Field circumference calculation The rectangular field is 2a meters long and a-2 meters wide. Calculate the field circumference.
- Transport coupon savings
The coupon allows you to travel by public transport with a 20% discount cost of 300 CZK. If the ticket costs CZK 20, how often do we have to go after buying coupons so we don't lose out on buying coupons?
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