Prime numbers - practice for 12 year olds - page 11 of 15
Number of problems found: 282
- Apples and pears
Mom divided 24 apples and 15 pears among the children. Each child received the same number of apples and pears - the same number as their siblings. How many apples (j=?) and pears (h=?) were received for each child? - Lcm simple
Find the least common multiple of these two numbers: 140 175. - Two rulers
We have two rulers. Scale interval on the first rulers is a spaced 1 cm and on the second is 15 mm. Rulers are attached to match initial divider commas. What next dividers commas coincide? Find at least three cases. - Two-digit number
I am a two-digit number less than 20. When I divide by three, you get the rest 1. When you divide me by four, you also get the rest 1. What number am I?
- Intervals 3487
The four teams left the terminal together at 5:00 in the morning. Line A runs at 15-minute intervals, line B at 6-minute intervals, line C at 20-minute intervals, and line D at 8-minute intervals. What time did all four lines leave the terminal together a - One-sixth 3279
If I had half as many nuts as I have now, I would have the same as Vendulka. If Vendulka had a third less than she has now, she would have the same size as me. If she had one-sixth less than she has and gave me that part, we would have the same amount. Ho - Preparatory 3222
Less than 50 pupils go to 9A class. A third of the pupils wrote the preparatory test with a one, a quarter with a two, no one wrote with a three, and nine pupils with a four. How many students from 9A wrote the test with a five? - Bouquets 3220
No flower will remain if the gardener binds bouquets of 3, 4, and 6 flowers. If she ties a bouquet of 7 flowers, two are missing. How many flowers does a gardener have? - Square tiles
The room has dimensions of 12 meters and 5.6 meters. Determine the number of square tiles and their largest dimension to exactly cover the floor.
- Rectangular flowerbed
Around the rectangular flowerbed with dimensions of 5.25 m and 3.50 m, roses should be planted at the same distance from each other so that the roses are located in each corner of the flower bed and are consumed as little as possible. How far do we plant - Class 9A
On the final certificate, one-quarter of the class 9A marked “C” in mathematics, the seventh mark “C” from the Czech language, and two students failed in chemistry. How many students attend class 9A? - Intervals 3044
At 9:00 a.m., three local buses met at the stop. The first bus has intervals of 20 minutes, the second every 25 minutes, and the third every 30 minutes. At what time will they meet again at this stop? - Mathematics 2980
More than 20, but less than 40 pupils go to 1.S. A third of the pupils wrote the mathematics test with a one, a sixth with a two, and a ninth with a three. No one got a high five. How many 1.S pupils wrote the test with a four? - Bus lines
Bus connections are started from the bus stop on its regular circuit: No. 27 bus every 27 minutes and No.18 every half hour. What time start these two bus lines run if the bus stop meets at 10:15 am.?
- Calculate 2976
Calculate the least common multiple of 120, 660, and 210. - Necessary 2895
From two wooden poles 240 cm long and 210 cm long, it is necessary to cut pegs of the same length as long as possible so that no residue remains. How many such pins can be cut? - Sunbathed 2861
There were more than 40 and less than 80 children by the pond. A fifth of the children took a bath, and a seventh sunbathed. How many children were at the pond? - Digits of age
The product of the digits of Andrew's age six years ago is the same and not equal to 0. Andrew's age is also the youngest possible age with these two conditions. After how many years will the product of the digits of Andrew's age again be the same as toda - Granddaughter 2789
Grandma and her granddaughter Barunka have a birthday on the same day. During six consecutive birthday celebrations, Grandma's age was always divisible by Barunka's age. How many birthdays did Grandma celebrate at the last of these six celebrations? Grand
Do you have homework that you need help solving? Ask a question, and we will try to solve it.