Maths practice for 14 year olds - page 287 of 370
Number of problems found: 7384
- Calculate 3956
The rotating cylinder has a diameter of 14 cm and a surface of 1,186.92 cm square. Calculate the height of the cylinder. - Dimensions 3950
Calculate the solid diagonal of a block whose dimensions are: a = 3cm, b = 5, c = 7cm. Find its volume as well. - Expression 3949
Determine what y equals in expression (16^y): 5 = 0.4 - 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 - Determine 3945
Determine the sum of the square roots of the number 25. - Centimeters 3940
Calculate the solid diagonal of a cube whose surface equals 24 square centimeters. - Three-day 3939
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 nines on the third row. Finall - Tunnels
Mice had built an underground house consisting of chambers and tunnels: • each tunnel leading from the chamber to the chamber (none is blind) • from each chamber lead just three tunnels into three distinct chambers, • from each chamber, mice can get to an - Unknown 3922
16% of the unknown number equals the square root of the number 25. Find this unknown number. - Circumference 3919
Determine the diagonal of a square whose circumference is equal to 72 cm. - Average speed
What is the average speed you have to move around the world in 80 days? (Path along the equator, round to km/h). - Dictation
A total of 30 students wrote the dictation. One third of them got a one or a four. Four times more twos than threes. How many students have an insufficient grade, if we know that 7 students got a first grade, which is also the same number as the sum of th - Area and percents
Find what percentage is a smaller cube surface when the wall's surface area decreases by 25%. - Four-digit 3912
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). Ondrej wanted half of all the fish, but to avoid cutting any fish, he got half the fish more than he wanted. Matej wanted half of the remaining fish, but like Ondrej, he got half the f - 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?
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