Math practice for 13 year olds - page 323 of 421
Number of problems found: 8410
- Glass
How many glasses are needed to produce glass with a base of a regular 5-gon if one base triangle in the base is 4.2 square cm and the height is 10 cm? - Z9-I-4
Kate thought of a five-digit integer. She wrote the sum of this number and its half in the first line of the workbook. Write a total of this number and its fifth on the second line. She wrote a sum of this number and its one ninth on the third row. Finall - Tunnels
Mice built an underground house consisting of chambers and tunnels: • every tunnel connects one chamber to another (no dead ends), • exactly three tunnels lead from each chamber to three distinct other chambers, • from every chamber, a mouse can reach any - Unknown number
16% of the unknown number equals the square root of the number 25. Find this unknown number. - Square diagonal
Determine the diagonal of a square whose perimeter is equal to 72 cm. - Average speed
At what average speed would you have to travel around the world in 80 days? (Assume a path along the equator; round to km/h.) - Area and percents
Find what percentage is a smaller cube surface when the wall's surface area decreases by 25%. - 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
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