Maths practice for 12-year-olds - page 231 of 351
Number of problems found: 7019
- Concentric 6751
A circle K with radius r = 8 cm is given. How big a radius must a smaller concentric circle divides a circle K into two parts with the same area? - Ophelia
Ophelia recorded the temperature of a cold store every two hours. 1. At 6 am, it was -4°C, and at 8 am, it was -1°C. By how much did the temperature rise? 2. The temperature went up by 5°C in the next two hours. What was the temperature at 10 AM? - Around
Around the circular flowerbed with a radius of 2 m is a sidewalk 80 cm wide. How many square meters does the sidewalk have? - Certificate 6740
There are 19 children in class 6A, 7 subjects, and no one has a worse grade than a three. Can each of them have a different certificate? How many would have to be in the class so that everyone could not have another report card? - Two rectangles
I cut out two rectangles with 54 cm² and 90 cm². Their sides are expressed in whole centimeters. If I put these rectangles together, I get a rectangle with an area of 144 cm². What dimensions can this large rectangle have? Write all options. Explain your - Sandbox
Sandbox has an area of 32 sq ft and a length of 4 1/2 ft. What is the width of a sandbox? - Average 6717
How many kg of coal can fit in 1 m³? Note - 1 m³ (1000 liters) of brown coal walnut 2 weighs, on average, 720 kg. - Length subtracting
Express in mm: 5 3/10 cm - 2/5 mm - Simplify 3
Simplify mixed numerals expression: 8 1/4- 3 2/5 - (2 1/3 - 1/4) Show your solution. - Adding mixed numerals
3 3/4 + 2 3/5 + 5 1/2 Show your solution. - Different 6709
Milan found out that he could wear pants and a T-shirt in a total of 28 different ways. How many T-shirts and pants can he have? List all options. - Glass with icecream
We have six kinds of ice cream and five kinds of fruit. If we put three cups of ice cream and two fruits into each glass, how many uniquely decorated glasses can there be? - Premiere 6693
How often does a bike with a 100cm premiere turn on a 24 km long track? - Credited 6691
The prize on the winning passbook with a deposit of CZK 12,390 was 15%. How much will be on the book after the prize is credited? - Summer camp
Eighty-four children spent their holidays at the summer camp. There were eight fewer boys than girls. What percentage were boys, and what percentage were girls? - Calculate 6687
Calculate the sizes of the remaining inner and outer angles. Alpha with comma α '= 140 ° and beta with comma β' = 100 °. - Sand path How much m³ of sand is needed to fill the 1.5m wide path around a rectangular flowerbed of 8m and 14m if the sand layer is 6cm high?
- Regular prism
The regular four-sided prism has a base of 25 cm² and a surface of 210 cm². Find its volume. - Interior angles
You know the size of the two interior angles of the triangle alpha = 40° and beta = 60°. Calculate the size of the third interior angle. - Twenty-minute 6665
The truck driver left Prague at 7:20 a.m., took a twenty-minute break in Poděbrady, and reached Hradec Kralové at 8:55 a.m. How long did the whole journey take (including a break)? How long was the ride itself?
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