Maths practice for 12-year-olds - page 228 of 347
Number of problems found: 6932
- Two chords
There is a given circle k (center S, radius r). From point A, which lies on circle k, are starting two chords of length r. What angle do chords make? Draw and measure. - Sweater
Dana confuses me by stating that sweaters and wool have a choice of seven colors. How many ways can she choose from three colors for the sleeves? - No smoke
Tobacco company NO-SMOKE adorned its stand at the cigarette-type trade fair with cigarette-shaped. The dimensions of which were 20 times the size of a regular cigarette. Regular cigarette contains 0.8 mg of nicotine. How much nicotine would a giant cigare - Cube walls
Find the cube's volume and surface area if the area of one of its walls is 40 cm². - Concentric circles
A circle K with radius r = 8 cm is given. What radius must a smaller concentric circle have to divide circle K into two parts of equal 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? - Different Report Cards
There are 19 children in class 6 A, 7 subjects, and no one has a grade worse than a C. Can each of them have a different certificate? How many would have to be in the class so that everyone could not have a different 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? - Coal Weight per Cubic
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. - Outfit Combination Count
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? - Bicycle Wheel Rotations
How many times does a bicycle wheel with a 100 cm circumference turn on a 24 km long track? - Bank Deposit with Prize
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? - Interior Exterior Angles Size
Calculate the sizes of the remaining inner and outer angles. Alpha with comma α '= 140 ° and beta with comma β' = 100 °.
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