Maths practice for 14 year olds - page 278 of 362
Number of problems found: 7230
- Percents of percentages
Calculate: (a) 5% of 25% of 85 b) 4% of 20% of 1500 c) 83% of 20% of 25 d) 0.3% of 70% of 90 - Square root sum
Determine the sum of the square roots of the number 25. - Cube diagonal
Calculate the solid diagonal of a cube whose surface equals 24 square centimeters. - Part-time earnings
Petr got a three-day part-time job for the holidays. On the first day, he earned 1/4 of the total amount. On the second day, 2/5 of the last two days, and on the third day, he made CZK 450. How much did you earn in total? - Area of a cube Calculate the surface area of a cube if its volume is equal to 729 cubic meters.
- 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.) - Dictation
A total of 30 students wrote the dictation. One third of them received a grade of 1 or 4. There were four times as many 2 s as 3 s. How many students received an insufficient grade, given that 7 students received a grade of 1, which is also equal to the s - 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? - 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?
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