Math practice for 13 year olds - page 293 of 428
Number of problems found: 8549
- In and out
The empty tank is filled in 12 minutes and empty in 16 minutes. If we forget to close the drain, how long does it take to fill? The tank has 1000 liters of volume. - Race Length from Fraction
Cyclists ran 3/7 of the total length during the race and had 80.5 km to finish. How long is the race? - Two forces
The two forces, F1 = 580N and F2 = 630N, have an angle of 59 degrees. Calculate their resultant force, F. - Grain sowing area
According to the sowing plan, sugar beet and grain are to be sown on an area of 840 ha. The area sown with sugar beet should be three times larger than the area sown with grain. What area should the grain be on? - Orchard
Three-fifths of the orchard are apple trees, and one-third of the trees are cherries. The remaining five trees are pears. How many trees are in the orchard? - Banana distribution
The children disassembled 48 bananas on the trip. Some children took 1 banana each, 6 children took 2 bananas each, and last, Anina was the only one who did not take even 1 banana. How many children were on the trip? - Rectangle measurements
In the ABCD rectangle, the AB side is 16 cm long, and the AC diagonal is 20 cm long. Calculate the perimeter and area of the rectangle. - Right Triangle Perimeter
We sorted the lengths of the sides of the two triangles by size: 8 cm, 10 cm, 13 cm, 15 cm, 17 cm, and 19 cm. One of these two triangles is right-angled. Calculate the perimeter of this right triangle in centimeters - Tea mixture
Of the two sorts of tea for 180 CZK/kg and 240 CZK/kg, we make a mixture of 12 kg that we should prepare for 200 CZK / kg. How many kilos of each sort of tea will we need to be mixed? - Red Blue Cars Count
There are 56 red and blue cars in the parking lot. Red is seven times less than blue. How many blue cars are there? - Pyramid Surface Area
The pyramid has a rectangular base with dimensions a = 5cm, b = 6cm. The side edges are identical; their length is h = 11cm. Calculate the surface of the pyramid. - Paper Collection Weight
Kamil and Kamila brought a total of 140 kg of paper. Kamila weighed 30 kilograms less than Kamil. How much Kamil brought, and how much was Kamila? - Tv screen
The length of its diagonal gives the size of a tv screen. If the dimension of a tv screen is 16 inches by 14 inches, what is the TV screen size? - How many
How many double-digit numbers greater than 30 can we create from digits 0, 1, 2, 3, 4, and 5? We cannot repeat numbers in a two-digit number. - Cone measurements
Calculate the volume and surface of the rotating cone with the base radius r = 4.6dm and the height v = 230mm. - Notebook Price Increase The notebook cost 10.50 euros after an increase of 40%. How many euros would it cost if it increased by only 20%?
- Probability - Number Less Six
There are 1 to 20 start numbers in the draw. What is the probability that the first downhill raffle will draw a start number less than 6? - Arrowroot - vitamins
Ten grams of kiwi contains the same amount of vitamin C as 50 grams of oranges. One hundred grams of arrowroot contains the same amount of vitamin C as 200 grams of kiwi. How many grams of oranges contain the same amount of vitamin C as 50 grams of arrows - Loan Repayment with Interest
Calculate how long it will take the Šetrný family to repay the loan if, after the first year, they paid €1350 in interest and the loan's interest rate was 6% p.a. They will repay the loan to the bank for €3,000 each year, and the bank will only add intere - Tetrahedron
What is the angle of the sides from the base of a three-sided pyramid where the sides are identical?
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