Math practice for 13 year olds - page 319 of 413

Number of problems found: 8260

Four-digit numbers
Create all four-digit numbers from digits 1,2,3,4,5, which can repeat. How many are there?
Cuboid enlargement
By how many percent increases the volume of the cuboid if every dimension increases by 30%?
Pet store
They sold fish from one aquarium from the breeding product (Zverimex). Andrew wanted half of all the fish, but to avoid cutting any fish, he got half the fish more than he wanted. Matthew wanted half of the remaining fish, but like Andrew, he got half the
Three friends
Three friends divided the profit by 104,650 CZK so that for every 4 CZK, which got the first friend, equals five crowns for the second, and for every 9 CZK, which got the second, equals 16 CZK for the third. Question: Who got the most and how much?
Cacao
Cacao contains 34% filling. How many grams of fill are in 130 g cacao?
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?
Shorts probability
Michal chose blue, white, red, orange, black, and brown shorts. What is the probability that he will select blue shorts?
Exponent value
Determine what z equals in the expression 169^z = 2 · 6.5
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.
Percentage calculation
Determine how much equals 16% of a) 32, b) 44, c) 34, d) 25
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?
Root ratio
Determine the ratio of the square root of the number 27 and the square root of the number 16.
Task completion
Milos had to do 20 clicks. However, he only made 16. What percentage did he miss in completing the task?
Number difference
The difference between the two numbers is 16. They are natural numbers. The first number is 17 times larger than the second number. Identify both of these numbers.
Exponential equation
Determine the value of having y in the expression (3^y): (4^-1)=36. Unknown y is a natural number greater than zero.
Raspberries
Dan had 20 raspberries, and John had 90% more raspberries than Dan. Find the total number of raspberries Dan and George have together.
Money duo
Julius and Mark have 45 euros together. Mark has 50% more money than Julius. Determine the amount of money Mark and Julius have.

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