Maths practice for 12-year-olds - page 281 of 350

Number of problems found: 6996

Mathematical 3918
For the variables x = -8, y = 12, z = -5, evaluate these two mathematical expressions a = y-z b = z / (x-z)
Average speed
What is the average speed you have to move around the world in 80 days? (Path along the equator, round to km/h).
Centimeters 3913
Calculate the diagonal of a square whose area equals 625 square centimeters.
Mathematical 3911
For the variables x = 8, y = 12, z = -5, evaluate these two mathematical expressions a = y-z b = z / (x-z)
Millimeters 3903
The surface area of one cube wall is 2500 square millimeters. Determine the cube's surface, the length of its edge, and its volume.
Cube 5
The surface area of one cube wall is 32 square centimeters. Determine the length of its edges, its surface, and volume.
Cube edge
Determine the cube's edges when the surface is equal to 37.5 cm square.
Unknown number 7
16% of the unknown number is 21 less than the unknown number itself. Determine the unknown natural number.
Three children
Three children eat eight chocolates in 6 days. How many chocolates do six children eat in 18 days?
Percentage 3892
The bar contains 81g of coconut per 200g. What percentage of coconut does the bar have?
Chocolate 3886
Chocolate has 86% cocoa. Determine how many grams of cocoa are in 165-gram chocolate.
Determine 3885
Determine the sum of the square roots of 81.
Equal 3883
What is equal to twice the sixth root of 729?
Determine 3880
Determine how much equals 16% of a) 32, b) 44, c) 34, d) 25
Change the numbers in the ratio
Change the numbers 29, 38, and 43 in a 3:4 ratio.
Runner 2
Marian runs 12 meters in 8 seconds. How far would Marian run for 70 seconds if he still runs at the same pace?
Independently 3874
Josef would do the work himself in 5 hours. Josef and Michal would do the work together in 3.5 hours. Determine how long it would take Michal to do the job independently.
Percentage 3872
Milos had to do 20 clicks. However, he only made 16. What percentage did he miss in completing the task?
Unknown number 5
Daniel thinks of an integer. When he changed this number to a ratio of 2:5, he got the number 2.8. Determine what number Daniel thinks.
Raspberries
Dano had 20 raspberries, and John had 90% more raspberries than Dano. Find the total number of raspberries Dano and Juraj have together.

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