Maths practice for 11-year-olds. - page 193 of 225
Number of problems found: 4482
- Block edge
The block's surface area is 94 cm². The lengths of its two edges are a = 3 cm and b = 5 cm. Calculate the length of its third edge. Let's say: From the formula for the block surface, first calculate c. - Container height
The cylindrical plastic container has a bottom diameter of 2 dm. How tall must the container be to hold 5 liters of water? - Unknown number
Determine an unknown number. Its double is equal to its triple less 1.5. - Tablecloth
The table top is 90 cm long and 50 cm wide. How many cm of lace edging is necessary for the tablecloth that hangs on each side by 10 cm? - Text messages
If the amount for the last text messages in one month with the mobile operator MOBY exceeds 14 euros (it costs 100 cents), each additional text message costs 13 cents. a) From what time does the price of a text message become 13 cents? b) How much does it - Foot in bus
It was 102 people on the bus. Twenty-eight girls had two dogs. Eleven girls had one dog. Five dogs (even with their owners) seceded at the next stop. They got two boys together with three dogs. The bus drove one driver. How many feet were on the bus? - Expression equals 100
Write any numeric expression whose value is 100 and will contain at least four different mathematical operations. - Sound travel
Sound travels in the air at a speed of about 330 m/s. Make a table of the dependence between the time (after one second), and the sound's distance travels during this time. During a storm, you can easily find out how far you are from it. - Even / odd numbers
a / Using variable n, write two consecutive odd numbers. b / The sum of three consecutive odd numbers is 333. What are these numbers? - Moneys in triple ratio
Milan, John, and Lili have a total of 344 euros. Their amounts are in the ratio of 1:2:5. Determine how much each of them has. - Ages
John, Teresa, Daniel, and Paul have a summary of 56 years. Their ages are in a ratio of 1:2:5:6. Determine how many years each has. - Tripled square
If you tripled the length of the sides of the square ABCD, you increased its area by 200 cm². How long is the side of the square ABCD? - Bricks wall
There are 5000 bricks. How high wall thicknesses of 20 cm around the area, which has dimensions of 20 m and 15 m, can use these bricks to build? Brick dimensions are 30 cm, 20 cm, and 10 cm. - Vitamin content
To complete valuable nutrition, a person needs vitamins that support physiological processes in the body and have a protective function. One of the most important vitamins is vitamin C. The recommended dose for adolescents is 70-90 mg per day. Calculate h - Fraction equation
Solve the equation: 5-y / 3-6-4y / 5 = 0 - Purchase - store Mom bought in the store 3 kg of sugar for Sk 19.50, two milk for Sk 13.10, bread for Sk 17.60, 20 eggs for Sk 2.55, salami for Sk 138.75, and oranges for Sk 42.80. She had 728.35 SK in her wallet before the purchase. How many crowns did she have left afte
- Whale weight
The largest mammal and animal ever is the giant flounder, which weighs up to 160,000 kg. How many times is heavier than a weighing elephant 4,000 kg? - Cigarette consumption
In 1983, the world produced 27 million cigarettes and cigars. If one person smokes 20 cigarettes a day, how many people smoked a day in 1983? - Population growth
The world's population is growing by 94,867,200 each year. How much is it a) month, b) day, c) hour, d) minute? - Elephant population
In 1979, 1.3 million elephants lived in Africa. By 1989, their number had dropped to 600,000. On average, how many elephants have died each year during this period?
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