Math practice for 13 year olds - page 252 of 428
Number of problems found: 8557
- 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? - Stable people count
There are nurses and horses in the stable. Juraj calculated that they have 11 heads and 36 all legs. How many people are in the stable? - Age comparison puzzle
Five years ago, Adam was seven times more than Peter and ten years more than Peter. How old is Adam older than Peter? - 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. My father said: I will have twice as much as I had eight years ago in ten years. - Roller Skates Speed Time
Miloš goes to school on roller skates at a speed of 18 km/h. The journey takes 15 minutes. What speed does he have to go if he wants to be at school 5 minutes earlier? - 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? - Proportion of the continents
The area of Asia and Africa is 8:7, and the area of Europe and Africa is 5:6. In what proportion are the sizes of regions of Asia, Africa, and Europe? - Bottle
A company wants to produce a bottle with a capacity of 1.25 liters. Find the dimensions of a cylinder that will be required to produce this 1.25 liters if the height of the cylinder must be five times the radius. - Bucket Water Weight Empty
A full bucket of water weighs 10kg. Half weighs 5.5 kg. How much does a bucket weigh? - Red and White Marbles
There are only red and white marbles in the bag, and precisely 18% of the marbles in the bag are red. After removing 25 white balls, exactly 20% of the balls in the bag will be red. How many balls are there? Thank you very much for your help - Ladder Shadow Length
Calculate the length of the shadow of a ladder 8 m long leaning against a 6 m high wall. (the sun shines perpendicular to the ladder - see picture). - Sales off
The price has decreased by 20%. How many percents do I have to raise the new price to be the same as before the cut? - Two Companies Working Together
Two construction companies are working on the landscaping. The first would do the whole job in 12 days, the second in 20 days. How long will they work together if the first start working when the second has already worked 4 days? - Pupil transportation count
One-third of the pupils go to school by bus. The other half take a tram, and the remaining ten pupils walk. How many students are in the class?
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