Maths practice for 12-year-olds - page 278 of 350

Number of problems found: 6985

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: (0.64^0.5): 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: (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?
Number 3797
Which number is hidden behind x: 2 · x = 16^0.5
Two rulers
We have two rulers. The scale interval on the first ruler is spaced 1 cm, and on the second is 15 mm. Rulers are attached to match the initial divider commas. What next dividers commas coincide? Find at least three cases.
Amount 3791
X + Y = 31835 X is the amount stolen by 1,2 and 3 Y is the amount stolen by 4 and 5 1. stole half of X, 2. half the rest and 3 more on top of that 3. stole 6801.5 4. He stole 1/9 of Y, which is 513 5. He stole the rest
Average speed
Michal left the house by car at a 98 km/h speed. He came into the goal place for 270 minutes. Determine the distance between the two places.

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