Math practice for 13 year olds - page 247 of 413
Number of problems found: 8260
- Pool filling time
The garden children's pool has the shape of a cylinder with a base diameter of 3.2 m and a depth of 60 cm. How many hours and minutes will it fill 10 cm below the edge of 0.5 l of water per second flows through the tributary? Round to whole minutes and wr - Pages counting
There are pages numbered 2 to 104 in the book. How many digits have to be printed to number the pages? - Dividing a Circle
Draw a circle k, r = 4 cm, and divide it into two parts in a ratio of 1:5. - Persons
Persons surveyed:100 with the result: Volleyball = 15% Baseball = 9% Sepak Takraw = 8% Pingpong = 8% Basketball = 60% Find the average of how many like Basketball and Volleyball. Would you please show your solution? - Simplify
Simplify expression - which expression is equivalent to: 3(m + 2) − 4(2m − 9) - Textbook page numbering
A total of 3389 digits were needed to number all the sheets of the mathematics textbook. Assume that in a book, every leaf outside the plates is numbered. How many pages does this textbook have if it is: a) single-volume b) two-volume (with both parts hav - Electric charge time
How long does it take for a 15 C charge to pass through the conductor's cross-section if a 3 mA current passes through the driver? - Workers - earning
Twelve workers would earn € 800 in 10 days. How many euros would 14 workers earn in 8 days? - Which
Which decimals, when subtracted, equal 3.89: a - b = 3.89 - Number Multiply Increase Percent
What number do we need to multiply by 20 to increase by 5% - Diameter of a cylinder
The diameter of the cylinder is 42 cm. How many times does the cylinder turn on a 66 meters long track? - Three-part novel In how many ways can seven books be arranged on a shelf if the three volumes of a novel must always be placed side by side?
- Digit Count Numbers Sequence
How many digits 7 are in numbers from 1 to 777? - Circles Screen Appearance Rate
The monitor screen is blank. Four new wheels appear on the screen every seven seconds when the beep sounds. On the contrary, three wheels disappear from the screen every eleven seconds. If both actions should take place simultaneously, the number of circl - In the orchestra
In the school orchestra four musicians play – one the violin, one the clarinet, one the cello, and one the trumpet. During a performance not always all four play at once. Sometimes only one instrument plays, sometimes two, sometimes three, and sometimes a - Practice
How many ways can you place 20 pupils in a row when starting on practice? - Two gears
The two gears fit together. The larger gear has 32 teeth. The smaller gear has 20 teeth fewer. How many times does turn a smaller gear if the bigger gear turns three times? - Number axis distance
How many double-digit numbers lie on the number axis closer to the number 31 than to the number 100? - Swimmer direction time
Two swimmers trained together in a small pool. Swimmer Pike will swim the pool in 16 seconds and swimmer Kaprik in 20 seconds. Both swimmers suddenly jumped into the pool from the same edge and, for 160 seconds, swam along the length of the pool back and - Three segments
The circle is divided into three segments. Segment A occupies 1/4 of the area. Segment B occupies 1/3 of the area. What part is occupied by section C? In what proportion are areas A: B: C?
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