Maths practice for 12-year-olds - page 224 of 347
Number of problems found: 6923
- Cube Edge Length Surface
When the surface of a cube is S = 150 cm², what is the length of its edge a =? - Pool Water Height Volume
The pool measures 4 m and 3 m, and 2.5 m. What height does the water in the pool reach if 25 m³ of water has been added? Round the result to centimeters. - Balls Bet Win
Josef had three balls less than Jan. They bet ten balls, and Josef won. Who has more balls now? - Supplementary angles
One of the supplementary angles is larger by 33° than the second one. Calculate the angles sizes. - Circumference - trapezoid
Calculate the circumference of the trapezoid if the lengths of the sides are as follows: a = 26 cm, b = square root of 50, c = 9 cm, d = 13 cm. - Edges or sides Calculate the cube volume if the sum of the lengths of all sides is 276 cm.
- Athletes
At the stadium, athletes could enter two-steps, three-steps, four-steps, five-steps, and six-steps. There were more than 100 but less than 200. How many athletes were there? - Bus Lines Departure Time
Three different bus lines, 80, 81, and 82, depart from the final station at 5 h 20 min. Line 80 departs every 30 minutes, line 81 every 20 minutes, and line 82 every 40 minutes. What time will they leave again? - Ping time
Calculate the theoretical ping time between Orlando and Shenzhen, which is 14102 km distant. Ping time measures the round-trip time for small messages sent from the origin to a destination that is echoed back to the source. The name comes from active sona - Phone plan
Victoria's cell phone plan costs $30.00 a month. How much did Victoria pay per minute if she used 12.5 hours in May? - Perimeter of square
The square has a circumference of 17 cm. What is its area? - Water level
How high is the water in the swimming pool with dimensions of 37 m in length and 15 m in width if an inlet valve is opened for 10 hours, flowing 12 liters of water per second? - Calculate rectangle
Calculate the unknown dimension in the rectangle if you know: S = 51.66 square meters, and = 8.2 square meters - Given
Given 2x =0.125, find the value of x - Evaluate expression 2
Evaluate expression with negatives: (-3)+4+(-8)+(-6)+4+(-1) - Workers 9
If two workers fix two windows in an hour, how many windows can 18 workers fix in the same two windows? - Triangle rectangle area
The triangle has a base of 7 cm and a height of 6 cm. The rectangle has one side of 10.5 cm and the same area as the triangle. What is the length of the other side of the rectangle? - Temperature conversion
The average human body temperature is 98.6 degrees Fahrenheit. What is the temperature in degrees Celcius? - Bun weight calculation
To prepare 40 buns, we need 3 dl milk, 3 dags of yeast, 6 g of sugar, 0.5 kg of flour, 4 spoons of oil, and 1 egg yolk = 15 g. After baking, the buns are filled with filling, for which we need 36 g of cheese, 20 dag of butter, and 200 dag of cream. How mu - Quarter of a circle
Calculate the circumference of a quarter circle if its area is S = 314 cm².
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