Maths practice for 12-year-olds - page 281 of 359
Number of problems found: 7168
- Baking bread
When grinding 100 kg of grain, we obtain 75 kg of flour for food purposes, about 23 kg of bran, which has further use, and about 2 kg is waste. 4.5 kg of bread is baked from 4 kg of flour. a) Baker can bake how many kilograms of bread from 100 kg grain? b - Bicycle gears
The toothed wheel on the bicycle pedal has 40 teeth, and the wheel on the rear wheel has only 16 teeth. How many times does the rear wheel turn if the pedals rotate 50 times? - Egg boiling
One egg is boiled for 5 minutes. How many minutes will five eggs be cooked? - Step journey
Hansel has a step length of 75 cm, and his little sister Dana is only 60 cm. How many steps does Dana take to school if Hansel walks 820 steps? How many steps does their father take on the same journey? The father's step length is 4.5 m per 5 steps. - Gasoline
The chauffeur paid 54 euros for a nearly full tank of 40 liters of gasoline. If the car has an average fuel consumption of 7 liters per 100 kilometers, how many euros will it cost to travel 250 km? - Exponent division
Specify the value of this expression: 214:218. - Cube measurements
Calculate the diagonal of the cube, with the circumference of one of its walls being 48 cm. Then, determine its surface and volume. - GCD and LCM
Specify: a = D (240,320) b = n (40.64) - Algebrogram
Solve algebrogram: mama+anna=vari How many solutions are? - Fabric package
They sold one-fifth of the fabric package in the store, and 44 m of fabric remained in it. How many meters of fabric were in the package? - 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? - Cubes from beam
The edge of the cube-shaped die is 3.5 cm long. How many of these cubes can be made from an oak beam 3.5 m long and a square cross-section with a side 35 cm long? - Share price
The initial share price first fell by 2%, and then this new price rose by 20%. The final share price is CZK 2,400. Calculate the initial share price. - Trapezoid median
The midsegment of the trapezoid is p = 18.6 cm, and the base a = 29.8 cm. Calculate the size of the other base c. - Wheel revolutions
The circumference of the vehicle's front wheel is 1.44 m, and the circumference of the rear wheel is 2.56 m. How long did the vehicle travel when the front wheel made 560 more revolutions than the rear? For the unknown, choose the number of revolutions of - Candy count
How many candies does Renee have in the box? There are fewer than 50. She can divide them evenly among either five or six friends, and still have one candy left for herself and her brother. How many candies are in the candy box? - Square perimeter
The Czech Republic has an area of 78866 km². If this area were the area of a square, it would have a side of 280.83 km. How long before we go around this square at 50 km/h? - Circle waste
Calculate the percentage of waste when we cut out 4 of the largest possible circles from a square sheet with sides of 1 meter. - Coat price
The cost of the coat, 1500kc, was reduced by 20% and increased by 20% after a week. What is the price? - Number average
The average of the two numbers is 74. One of these numbers is a) 62.5 b) 102 specify the second number
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