Maths practice for 12-year-olds - page 281 of 362
Number of problems found: 7228
- Calculated 4023
How much does the glass of a display cabinet with dimensions of 3m x 2m and a thickness of 10mm weigh if the weight of the glass is calculated based on its specific volume weight, which is 2600 kg/m³? Therefore, the weight of one sheet of glass measuring - Norm
Three workers planted 3555 seedlings of tomatoes in one day. The first worked at the standard norm, the second planted 120 more seedlings, and the third was 135 more than the first worker. How many seedlings were the standard norm? - Two machines
Performances of two machines are in a ratio of 7:12. A machine with less power produced 406 pieces of products per shift. a) How many pieces are produced per shift second machine? b) How many pieces produced two machines together for five shifts? - Orchard
3/5 of the trees in the orchard are apples, 1/3 are cherries, and the remaining five trees are pears. How many trees are in the orchard? - 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? - Minutes 4009
One egg is boiled for 5 minutes. How many minutes will five eggs be cooked?
- Journey 4008
Hansel has a step length of 75 cm, and his little sister Danka is only 60 cm. How many steps does Danka take to school if Jan walks 820 steps? How many steps does their father take on the same journey? Who walks 4.5 m in 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? - Expression: 4005
Specify the value of this expression: 214:218. - Circumference 4002
Calculate the diagonal of the cube, with the circumference of one of its walls being 48 cm. Then, determine its surface and volume. - Specify: 4001
Specify: a = D (240,320) b = n (40.64) - Algebrogram
Solve algebrogram: mama+anna=vari How many solutions are? - One-fifth 3999
They sold one-fifth of the fabric package in the store, and 44m of fabric remained in it. How many meters of material 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?
- Cross-section 3997
The edge of the cube-shaped dice is 3.5 cm long. How many of these cubes are made of an oak beam 3.5 m long and a square cross-section with a side 35 cm long? - Calculate 3996
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. - Calculate 3993
The median of the trapezoid p is 18.6 cm, and the base a = 29.8 cm. Calculate the size of the second base c. - Circumference 3991
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 - Candies 3989
How many candies does Renata have in the box? There are less than 50 of them. She can divide them fairly among her five or even six friends and still have one candy left over for her and her brother. How many candies are in the candy box?
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