Maths practice for 12-year-olds - page 250 of 347
Number of problems found: 6923
- Deca-kilogram
70g of yeast is needed for 30 days of flour. How many dags of yeast are required for 1.5 kg of flour? (note: the decagram has the mark dag and not dkg - it would be a deca-kilogram) - Triangle Height from Area
The parallelogram has a side 6 cm long, and the height on this side is 4 cm long. What is the height of an isosceles triangle with a base 6 cm long and the same area? - Soccer ball
How much does a soccer ball cost, and 6/7 of the price is € 12? - Garden fencing
The garden has the shape of a rectangle with dimensions of 32 m and 29 m. We must fence it all off, except for the entrance gate, which will be 4 m long. What is the size of the garden? - Cake packing
Grandma wrapped two-fifths of the cake for her granddaughter, Mary, and Eme wrapped one-quarter of the cake. What part did Grandma pack in the science, and what part remained with Grandma? - Plane speed
When it flies 106 km in 30 minutes, at what speed does the plane fly? - Simple equations
Solve the system of equations: 5x+3y=5 5x+7y=25 - Solving Linear Equation
Solve the equation: 0.5 • (3+ x) -0.2 • (0.5x-5) = 0 - Quadruple Number Range
A quadruple number from 2 to 17 is a number? - Number line arrangement
On a number line, arrange the points corresponding to the values a, 2a, and 3a + 1 in all possible orders. For each arrangement, decide whether it is possible. If yes, give a specific example; if not, explain why. - Three cubes
The body was created by gluing three identical cubes. Its volume is 192 cm³. What is its surface in dm²? - Filling Pool to Height
The pool is 15m wide and 40m long and should be filled with water to a height of 2.5m. The water flows at a rate of 400 hl per hour. How many hours will the pool be filled to the required height? - Circumference of the garden
The garden is 90 m long. What is the smallest width if it is possible to walk (circumference) in steps of 80 cm or 50 cm? - Machine price
After technical improvements, the washing machine cost € 630, which is a fifth more than the original price. How many euros did the washing machine initially cost? - Village Population Estimate
The population of the village rounding up to hundreds is 5600. Most how many inhabitants can live in this village? - Rectangle 39
Find the perimeter and area of the rectangular with vertices (-1, 4), (0,4), (0, -1), and (-1,-1) - Circle simple
The circumference of a circle is 6.28. What is the area of the circle? - The ball
Three friends go to buy a ball, and it costs 300 CZK. Everyone gives 100 CZK. Later, the seller finds out that the ball costs 250 CZK. He will send 50 CZK after the apprentice. The apprentice buys a snack for CZK 20. The shop will return 30 CZK to the boy - Family 8
The father is 38 years old, the daughter is 12, and the son is 14. In how many years will the father be as old as his children's ages combined? - Parallelogram perimeter
Triangle ABC has sides a = 5 cm, b = 3 cm, and c = 40 mm. K, L, and M are the midpoints of its sides. What is the perimeter of parallelogram KBLM in centimeters?
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