Maths practice for 12-year-olds - page 282 of 354

Number of problems found: 7071

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?
Work time
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.
Task completion
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.
Expression value
What is the value of this expression: (0.64^0.5): 4
Cancer
Of the 80 people, 50 people were ill with cancer. What percentage of people isn't ill?
Number calculation
1/6 of y equals 8.6. Determine y.
Percentage calculation
Determine what 305% of number 98 is.
Unknown number 6
Determine x if 1/6 of x equals 2/5 of the number 24.
Number puzzle
Anton said: I have a natural number x. I'll get three times as much if I increase it to four-thirds. What number did Anton mean?
Number ratio
Dano had a natural number in mind. If he changed this number to a 2:5 ratio, he would get the number 24 smaller. What number did Dano think?
Volume and area
What is a cube's volume with an area of 361 cm²?
Unknown number
Identify an unknown number whose 1/16 is 10.5, less than half of it.
Equation
Solve the equation: 1/2-2/8 = 1/10; Write the result as a decimal number.
Number ratio
Change the numbers 48, 27, and 36 in a ratio of 5:3.
Exponent ratio
What is the ratio of 2⁸:2^-5 equal?
Expression value
Specify the value of the expression: (1024^0.1): 9
Cargo
The car with cargo weighs 7610 kg, which is 23% of its total weight and cargo. How heavy is the cargo?
Exponent equation
Which number is hidden behind x: 2 · x = 16^0.5

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