Math practice for 13 year olds - page 108 of 422
Number of problems found: 8427
- Equipment 69464
Miša is buying skater equipment. He chooses one of 2 helmets, one of three gloves, one of four knee pads, and one of two elbow pads. How many options does it have for buying equipment? - Increases 69454
The car weighs 1850 kg and increases its speed from 27 to 81 km/h. How much has its kinetic energy increased? - Wallpapers 69424
Lucia's mobile phone offers a choice of 10 ringtones, seven tones when receiving an SMS, and 15 wallpapers in the background of the display. How many ways can Lucia set up her mobile? - Teacher 3 Teacher Ken is interested in buying a jacket at a discounted price. The price tag says the original price is Php 1250, which is 20% off. What would be his change if he gave the cashier Php 1000?
- The price 3
The price of a notebook is 20 percent less than that of a book. By what percent is the book's price higher than the price of the notebook? - Hands coincide
In how many minutes after the second hour do the clock hands coincide? - Lengths 69314
We must cut three steel bars with 24 dm, 3 m, and 160 cm lengths into equal lengths. Find their maximum length and number. - Determine 69304
Determine the size of the ACF angle in the regular ABCDEF hexagon. - Shoulders 69284
Two children with different weights sit on the swing, a lever with your shoulders. On the left side sits a child with a capacity of 30 kg, and on the right, a child with a capacity of 20 kg. One swing arm is 150 cm long. How would you seat the children so - Kilometers 69264
Laura went for a new bike ride. In an hour, her father followed her on the same route at 60 km/h speed and overtook her in 1/2 hour. a) Find the length of Laura's route in kilometers before her father catches up with her. b) Determine in kilometers per ho - Calculate radius
The surface of the sphere is 624 cm². Calculate its radius. - Magnification 69234
What magnification of magnifying glass in percent if the magnification is 4x? - Pre-Christmas 69224
The new type of PC became 15% more expensive before Christmas and is now being sold for CZK 13,800, which is 80% of the pre-Christmas (already higher) price. What was the original price of the PC before the price increase? - Consumption 69174
The tower's roof has the shape of the shell of a rotating cone with a base diameter of 4.3 m. The deviation of the side from the plane of the base is 36°. Calculate the consumption of sheet metal to cover the roof, assuming 8% for waste. - Spherical layer
What is the volume of the spherical layer that remains after cutting the paragraphs on both sides of the ball, whose height is 3.5 cm? Is the diameter of the ball 24 cm? - Pump power
Determine the pump power if: I pour 3 m³ of water from the tank in 120 seconds with a hose. The height of the hose mouth above the tank is 1.5 m. The water's speed from the hose outlet is 20 m/s. - Fraction and ratios
Fraction and ratios are different names for the same thing. - Calculate 69104
The diagonal of the TV screen is 82 cm, and the height is 40 cm. Calculate the width of the screen. - Sarrah
Sarrah bought cupcakes for her family. Thirty-six cupcakes are chocolate, and the rest are red velvet. If 80% of all the cupcakes she bought are chocolate, how many red velvet cupcakes did she buy? - Tangerines 68994
When the lion took two mandarins from the bowl and Milada took one-fifth of the rest, four mandarins remained in the bowl. How many tangerines were initially on the dish?
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