Maths practice for 12-year-olds - page 284 of 362
Number of problems found: 7228
- 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. - Expression: 3865
What is the value of this expression: (0.640.5): 4
- Cancer
Of the 80 people, 50 people were ill with cancer. What percentage of people isn't ill? - Determine 3860 1/6 of y equals 8.6. Determine y.
- Determine 3857
Determine what 305% of number 98 is. - Unknown number 6
Determine x if 1/6 of x equals 2/5 of the number 24. - Four-thirds 3852 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?
- Smaller 3848
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? - Identify 3828
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.
- Numbers 3819
Change the numbers 48, 27, and 36 in a ratio of 5:3. - Equals 3812
What is the ratio of 28:2-5 equal? - Expression: 3804 Specify the value of the expression: (10240.1): 9
- Cargo
The car with cargo weighs 7610 kg, which is 23% of its total weight and cargo. How heavy is the cargo?
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