Math practice for 13 year olds - page 338 of 422
Number of problems found: 8424
- trapezium 3428
Given is a trapezoid ABCD with bases AB, CD. Let K be side AB's midpoint, and point L be side CD's midpoint. The area of triangle ALB is 15 cm2, and the area of triangle DKC is 10 cm². Calculate the area of trapezium ABCD. - Subsequent 3427
Find how many strings there are in the first row if there are 44 strings in the eighth row, and in each subsequent row, there are five more strings than in the previous row. - Apples 3424
57 kg of 3q red apples is dried. How many dried apples do we get from 60 kg of fresh apples? - Accepted 3423
The material for 83 masons of the company is enough for 12 days. How many days will this supply be enough for them if the company has accepted six more masons? - Summer camp
Out of the 180 students at a summer camp, 72 signed up for canoeing. Twenty-three students signed up for trekking, and 13 also signed up for canoeing. Use a two-way table to organize the information and answer the following question: Approximately what pe - Quarter 3421
Lukáš was saving for new roller skates. The first month he saved a third of their price, the second month a quarter, the third month half of the rest of the price, and the fourth month €25. How much € did the skates cost? - Ninety-six 3420
Ninety-six soldiers will build a pontoon bridge in 5 hours. How long before the same bridge creates 54 soldiers? - Rectangle from string
String 12m. Make a rectangle when one side is two times longer than its width. - Diameter 3413
The farm provided around 150 fruit trees with a trunk diameter of 2 dm with mesh to protect them from wild animals. The mesh was placed so that it was 9 cm away from the trunk. How many regular meters of mesh were needed? - Three dice
What is the probability that when we roll three dice, we roll the number 1,2,3? - Pyramid 4sides
Calculate the volume and the surface of a regular quadrangular pyramid when the edge of the base is 4 cm long, and the pyramid's height is 7 cm. - Sputnik
The first Earth satellite was flying at a speed of 8000 m/s. At that rate, he circled the Earth in 82 minutes. Jet flies at an average speed of 800 km/h. How long would it take to circle the Earth around? - Roof 8
How many liters of air is under the tower's roof, which has the shape of a regular six-sided pyramid with a 3,6-meter-long bottom edge and a 2,5-meter height? Calculate the supporting columns occupy about 7% of the volume under the roof. - Cylindrical 3395
The cylindrical vase is 28 cm high. Its inner diameter d = 1.1 dm. How many liters of water will fit in it if the bottom thickness is 1.5 cm? - Cylindrical 3394
The cylindrical container with a diameter of 1.8 m contains 2000 l of water. What height does the water reach? - Rotating cone
Calculate the volume and the surface area of a rotating cone of base radius r = 2.3 dm and a height h = 46 mm. - Cube diagonals
If you know the length of the body diagonal u = 216 cm, determine the cube's volume and surface area. - Wednesday 3391
On Monday, three pupils were missing from the class, 12% of the total number of pupils. How many pupils were missing on Wednesday if 84% of all pupils were in school? - Algebrogram
Solve cryptarithmetic (alphametics) for a sum of three numbers: BEK KEMR SOMR ________ HERCI - Two-thirds 3388
The kneaded cake dough has a volume of 1.8 l. When baking, it increases its volume by about two-thirds. Can a baked wheel fit on a baking sheet measuring 36x30x8cm? How tall will the cake be after baking?
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