Math practice for 13 year olds - page 123 of 422
Number of problems found: 8424
- Kilometers 63354
The car will travel 154 km in 2.24 hours. How many kilometers will he travel at the same speed in 3.2 hours? - Calculating 63344
Calculate the volume of the cone formed by rotating an isosceles triangle about the height of the base. The triangle has a side length of 15 cm and a height to the base of 12 cm. When calculating, use the value pi = 3.14 and round the result to one decima - Probability 63324
The shooter fired 100 times on the ground. He had four times more successful hits than failed hits. What was the probability of a hit in percent? - Gradually 63314
The fishery gradually sold carp weighing 2 1/2 kg, 1 5/6 kg, 1 3/5 kg, 2 1/10 kg, 2 kg, and 2 2/3 kg. What was the average weight of 1 carp? - Probability 63304
One hundred fifty pupils go to the 9th year of primary school. Of these, 66 have no siblings, 39 pupils have one sibling, 18 pupils have two siblings, and the remaining pupils have more siblings. What is the percentage probability that a randomly selected - Sequentially 63274
In the pocket, there are six tickets marked with numbers 1 to 6. How many ways can we sequentially, taking into account the order, select 3 of them if the chosen tickets do not return to the pocket? - Direction 63264
A railway car weighing 10 t moves around the Earth at a speed of 10 m/s. Determine the kinetic energy of the car relative to the Earth and relative to another car moving at a speed of 10 m/s relative to the Earth, both in the same direction and the opposi - Triangle 63244
The area of the ABCD square in the picture is 36 cm². Points E and F are the centers of the square BC and CD sides. What is the area of the triangle AEF in cm²? - Volume 63234
The cube with a volume of 216 l has an edge with the following: - Unknown 63224
You will find an unknown number on the number line between 428 and the unknown number 290. - Original 63184
If you reduce the unknown number by 90, you get 88% of its original value. Specify this unknown number. - Hundredfold 63144
The length of the radius of the rotating cylinder base is 5 m. You calculate the radius of an equally high cylinder, the volume of which is a hundredfold. - Sidewalk 63134
A 2m wide sidewalk is built around the circular fountain. The radii of the circles that delimit the path on both sides are 4:3. What area in square meters does this sidewalk occupy? - Kilometers 63124
At 10:00 AM, a car started from place A at a speed of 70 km/h. 0.5 hours later, a car started from the same point at a speed of 100 km/h. What time did they meet? How many kilometers from point A did they travel before they met? - Perimeter 63114
The perimeter of the regular octagon is 8u + 16 cm. Calculate the side if u = 0.5 cm. - Rectangular 63094
Calculate the perimeter and the area of a rectangular garden if the diagonal length is 18 m long and one of the sides of the garden is 9m long. - Discounted 63084
The product was discounted by 15% and the price after the discount is 300 euros. How much did it cost before the deal? - Grandfather 63074
My only son was born when I was 37 years old. That was exactly 32 years after the death of my grandfather, and he died at the age of 64. Dedecek was 12 years older than Grandma; they got married in 1947, just when Grandma was 18 years old. What year was m - Smaller 63064
From which number is the number 60 20% smaller? - Number 63044
What number is under the letter D if: 88-A = 8 D = C: 10 B + 20 = A 5.B = C
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