Math practice for 13 year olds - page 211 of 431
Number of problems found: 8614
- Staircase 20203
The staircase has 36 steps, each 20cm high. How many stairs will the same staircase have if the height of the stairs is 18cm? - Troops
The tourist group has two leaders, with an average age of 30, and several children, with an average age of 10. The total age of the group is 12. How many children are in the group? - Average 20173
The average of the two numbers is 2.8. One number is 5. What is the second number? - Adjustment 20163
Two students adjust the flower bed in 3 hours. How long will this adjustment take for the pupils if they invite four helpers? - Fire tank
1428 hl of water is filled in a block-shaped fire tank with the edges of the base 12 m and 7 m. Calculate the area of water-wetted areas. - Regulations 20113
According to school regulations, a student receives an excellent grade if he achieves at least 26 points in a test with a total of 30 points. What is the minimum number of points a student must obtain in a test with a total of 50 points if the same passin - The florist
A consignment of 200 roses arrived at the florist in the morning. She sold more than half of them during the day. She wants to tie bouquets of the remaining roses. One rose will always be left if she ties a bouquet of three, four, five, or six roses. Dete
- Horses 20063
Nine horses need a lot of hay for two days. How many horses would the same amount of hay be enough for three days? - Supermarket 20053
When only three checkouts are open in a supermarket, people wait in line for an average of 10 minutes. How many minutes will the average waiting time in line be if two more checkouts open? - Apples 20043
From 10 kg of fresh apples, we get 1.25 kg of dried. How many kg of fresh do we need per 10 kg of dried? - Outside tangents
Calculate the length of the line segment S1S2 if the circles k1 (S1, 8cm) and k2 (S2,4cm) touch the outside. - Students 20003
The class's ratio of boys to girls is 5:7. There are ten boys. How many students are in the class? - Corona again The population on long island is 7.75 million, and the coronavirus has affected 22,178. What percent of the population is affected? (looking for one case per n people)
- Significant 19983
We roll two dice, red and green. What probability will a more significant number fall on the red dice than on the green? - Kilometers
The scale of the map is 1:100,000. How long is the road, which is 4.7 cm long on the map, really long?
- Five-digit 19873
Find the smallest five-digit number A432B that is divisible by 15. - Marks at school There are 30 students in the class. Five students in the class had a mark of three or triple at the end of the math certificate, and the other students had a mark of one or two. The average mark in all students' mathematics in the class at the end of the
- Successfully 19843
The drug successfully treats the disease in 96% of cases. Your doctor will treat 50 patients with this medicine. What number of cures is most likely? - Together 19833
Lucie, Jan, and Matej shared the candy in a ratio of 3:4:5. Matej got 20 sweets. How many candies did they share? - Rectangular 19823
Three hundred eighty-four tiles are used to cover the roof of 48 m². How many identical tiles are used for a rectangular roof measuring 6m and 9.5m?
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