Math practice for 13 year olds - page 248 of 415
Number of problems found: 8281
- 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? - Percentages
52 is what percent of 93? - Percentage of Percentage What is 17% of 30% of 500?
- Eight years ago
The son asks his father how old he is. His father said: "In ten years, I will be twice as old as I was eight years ago." - Two thirds
Two-thirds of the unknown number is 8/7. What is 7/3 of this number? - Ladder wall height
To what height does a 6.5 m long ladder leaning against a wall at a distance of 5.4 m reach?
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