Math practice for 13 year olds - page 333 of 422
Number of problems found: 8438
- Rectangles in circle
I need to fill a circle with a diameter of 4900 cm with how many rectangles, 125x60 or 100x50 cm. - Proportion
Write the following proportion: Eight is to 64 as to 2 is to x - Numbers
a/ I think of a number. If I add 6 to it three times, I get it five times. Determine this number. b/ I think of a number. If I add 8 to its six times, I get a number that is 10 less than its fifteen times. c/ I think of a number that, when increased by 6, - Broken tree
The tree is broken at 4 meters above the ground. The top of the tree touches the ground at a distance of 5 meters from the trunk. Calculate the original height of the tree. - Dice options
We roll three dice. Write down all the feast options. - Ant
An ant crawls on the coordinate system always parallel to the coordinate axes. Yesterday it started its journey in the point with coordinates 0. It went 20 squares along the x-axis, made a left turn and went again 20 squares. Again it made a left turn and - SMS time
Smith and Wyatt are leaving from a joint vacation. They agreed that when they were 100 km apart, they would text each other. Smith drives at 60 km/h and Wyatt at 90 km/h. They left at 2:00 PM (14:00). What time do they text each other? - Parallelogram diagonals
One side of the parallelogram is 5 cm. Can it have 3 cm and 6 cm diagonals? - Percentage calculations
Calculate to two decimal places. What percentage is: a / 15min from 4 h b / 35 cm² of 12.5 dm² c / 2 dm² of 400 cm² d / 0.2 l of 2.2 l - Map distance
On a tourist map with a scale of 1:20 000, the distance between Starý Smokovec and Nový Smokovec is 24 cm. What is the actual distance? - Equation with x
Solve the following equation: 2x- (8x + 1) - (x + 2) / 5 = 9 - Circle length
The 16 cm long string is 6 cm from the circle's center. Calculate the length of the circle. - Chord distance
There is a 12 cm long chord in a circle with a radius of 10 cm. Calculate the distance of the chord from the center of the circle. - Price increase
They increased the price of the social word game SCRABBLE from SKK 600 to SKK 900. By what percentage did they increase the price of the game? - Hall
A rectangular hall is to be paved with square tiles with a side length of 15 cm. The hall has a length of 18 meters and a width of 3 m. How many tiles do you need to buy if 2 percent of the amount are damaged during the work? - Hypotenuse length
Calculate the hypotenuse length if you know the area of an isosceles right triangle that is 24.5 cm². - Smoked meat
The meat loses 18% of its weight by smoking. How many kilograms of smoked meat can we make from 27 1/2 kg raw meat? - Isosceles triangle
Jan and her father were going to the tent. They found that their old tent was torn. Their mother suggested that they sew a tent with walls comprising six identical isosceles triangles. Their lower side is 2 m long, and the height to this side measures 2.5 - Active pupils
There are 35 pupils in the class, and 7 of them are active in sports. What is their percentage? - Mushroom water
A fresh mushroom weighs 8 kg. After drying, it weighed 96 dag. What percentage of water do fresh mushrooms contain?
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