Maths practice for 12-year-olds - page 276 of 347

Number of problems found: 6923

Cube edge
Determine the edge length of a cube whose surface area is 37.5 cm².
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 8 chocolates in 6 days. How many chocolates do 6 children eat in 18 days?
Coconut percentage
The bar contains 81g of coconut per 200g. What percentage of coconut does the bar have?
Cocoa percentage
Chocolate has 86% cocoa. Determine how many grams of cocoa are in 165-gram chocolate.
Square root sum
Determine the sum of the square roots of 81.
Root calculation
What is equal to twice the sixth root of 729?
Percentage calculation
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?
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
Dan had 20 raspberries, and John had 90% more raspberries than Dan. Find the total number of raspberries Dan and George 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 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?
Unknown number
Identify an unknown number whose 1/16 is 10.5, less than half of it.

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