Math practice for 13 year olds - page 307 of 420
Number of problems found: 8400
- Tree shadow
The shadow of the tree is 16 meters long. The shadow of a two-meter-high tourist sign beside standing is 3.2 meters long. What height is a tree (in meters)? - Interest rate
Charles saved SKK 12,000 in the savings bank at the beginning of the year. At the end of the year, the savings bank credited him with SKK 1,680. At what annual interest rate did Charles have the deposit in the savings bank? - Rectangular meadow
Divide the rectangular meadow with dimensions of 1280 m and 320 m into a square shepherd with the longest possible side of the square. How many square pastures did you divide the meadow? - Rainwater barrel
There are 1.5 hectoliters of rainwater in the barrel. Two-fifths of the water passed from the barrel while watering the garden. How many liters of water remained in the barrel? - Fraction equation
Solve the equation: 1/c - 3/(2c) = 3/4 - Apple harvest
Pupils collected a total of 42 kg of apples. Peter harvests half as much as Susan and Martin, a third less than Peter. How much did each of them harvest? - Acceleration distance
When accelerating from 0 to 100 km/h in 9.3 seconds, what distance will the car travel? - Triangle construction
Construct a triangle ABC if you know the lengths of its sides c = 5 cm, a = 4 cm and angle ABC is 60°. Measure the length of side b in millimeters. Side length b is: a, 75 mm < b < 81 mm b, 53 mm < b < 59 mm c, 43 mm < b < 49 mm d, 13 mm - Sun rays
If the sun's rays are at an angle of 60°, then the famous Great Pyramid of Egypt (which is now 137.3 meters high) has a 79.3 m long shadow. Calculate the current height of the neighboring Chephren pyramid, whose shadow is measured at the same time at 78.8 - Sugar cubes
The glass holds 600 ml of tea, which represents 80% of its volume. If twenty regular sugar cubes of 2 cm are poured into the tea, how many ml of tea are poured? - Trapezoid MO-5-Z8
Trapezoid KLMN has bases 12 and 4 cm long. The area of triangle KMN is 9 cm². What is the area of the trapezoid KLMN? - Earth and Sun
Earth is 150 million km away from the Sun. 300,000 km of sunlight travels in 1 second. How long will the light come from the Sun to the Earth? - Percentages 5
$5.25 is 7 1/2% of what number? - Railway wagon
The railway wagon holds a 75 m³ load. The wagon can carry a maximum weight of 30 tonnes. What is the maximum density that may have material with which we could fill this whole wagon? b) How much peat (density 350 kg/m3) can carry 15 wagons? - Bronze medal
To produce 1 kg of bronze must be 0.95 kg copper, 0.04 kilograms of tin, and 0.01 kg zinc. The bronze medal weighs 8.5 g. How much copper, tin, and zinc does the medal have? - Five-sevenths of a volume
Forty-two liters of water fill the barrel to two-thirds of its volume. If it is filled to five-sevenths of a volume, how many liters of water do we need to add? - New Year's
A shoe store had a special offer during the New Year's sale: if you buy two discounted pairs of shoes, you get the cheaper pair for 1/2 the price! Mrs. Ludmila decided to take advantage of this offer. She bought shoes for her son that were 60% off the ori - In the orchard
They planted 25 apple trees, 20 pears, 15 plums, and 40 marbles in the orchard. An intense late frost, however, destroyed a fifth of all new trees. Unfortunately, it was all the trees of one kind of fruit. What is the probability that the plums have died - Block volume
The sketch shows the net of a cuboid with a surface size of 150 cm². Calculate its volume. (MONITOR 9 - 2005/30 question.) - Plum dumplings
Three journeymen on their apprenticeship arrived completely exhausted at a tavern and ordered – it was at the end of summer – plum dumplings for supper. While supper was being prepared, they chattered and dozed at the table, until they fell soundly asleep
Do you have unsolved math question and you need help? Ask a question, and we will try to solve it. We solve math question.
