Maths practice for 12-year-olds - page 47 of 355
Number of problems found: 7086
- Isosceles
Isosceles trapezoid ABCD has a perimeter of 39 cm. The base AB is 7 cm longer than the base CD and the arm is 2 cm shorter than the base CD. Calculate the length of the base CD. - Determine the area
Determine the area of the trapezoid ABCD, in which the following holds: AB= 6cm, Area of triangle ABC= 15 cm2, area of triangle BCD= 20 cm2, AB||CD. - Teeth
An adult has a total of 32 permanent teeth. How many of them are molars if 1/4 of the teeth are incisors, another quarter are molars and the remaining quarter are canines? - Fuel and oil ratio 2T
Add 4 liters of gasoline with oil in a ratio of 33:1. How much oil is needed? - Products - defective
Among 125 products, 56 were defective. What percent of products are without defects? - Evaluate expression
Evaluate the expression written in words: -1 and two/7 + parenthesis -2 and one/4 end of parenthesis + 1/two = - Average 110
The average of five numbers is 1.3 their sum is? The arithmetic mean of the numbers 0.04; 0.014; 0.21 is? The arithmetic mean of four decimal numbers is 2.5. Three of these numbers are 1.8; 0.65; 3.1 the fourth number is? - Two cuboids
The cuboid has dimensions of 2m 3m 4m We increase the length of all edges by 50 cm. 1. Calculate in % how much the surface area of the cuboid increases compared to the surface area of the original cuboid - round the result to whole percent 2. Calculat - Buses 7
Two lines leave the bus stop according to the schedule A) 8:00 every 6 minutes until 23:00h B) 8:00 every 14 minutes until 23:00h How many times will buses of both lines leave the bus stop simultaneously between 8:01 and 20:00? - Heating water
5 kg of water warmed up by 10°C. How much heat did the water absorb? (Remember that 1kg of water needs 4,200J of heat to raise its temperature by 1°C.) - Dividing Fruit by Ratio
60 kg of fruit were divided into the KOP store and the FRESH store in a ratio of 2:3. How many kilograms did the FRESH store receive? - Reading a Book Faster
Jana received a new book. She wants to read it in 8 days. If she read 6 more pages a day, she would read the book two days earlier. How many pages does the book have? - Multiplying Absolute Value and Reciprocal
What do we get by multiplying the absolute value by the number -0.7 and the reciprocal of the number by the number 10? - Raspberry juice
How much will the scout leader pay for drinks for the children if a third of the children had a raspberry juice for 10 CZK, half of the children had sparkling water for 15 CZK, and the remaining 4 children had a kola for 20 CZK (CZK = Czech crowns)? - Dependent variables
A printer prints k sheets in n seconds ( k, n ϵ N ). Express the number of sheets that the printer prints in 5 minutes in terms of k and n. - Concert organizers
800 people came to the concert, a quarter more than the organizers expected. How many people did the organizers expect? - Coal Used and Remaining
We used one-quarter of the coal we bought, leaving us with 12 q. How much coal did we buy? - Cutting a cuboid
A cuboid can be cut into 200 cubes, each with a volume of 8 dm cubic. Calculate how many cubes with a volume of 1 cm cubic can this cuboid be cut into without a remainder. - Finding the Second Number The arithmetic mean of two numbers is 10. One of the numbers is 2. What is the second number?
- TEV physical education
The students lined up in threes in a physical education class, then in fours, and there was always one extra student. What is the least number of students that could be in the gym?
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