Math practice for 13 year olds - page 2 of 429

Number of problems found: 8561

The ratio 22
The ratio of two numbers is 5 : 4 and their LCM is 800. Find the sum of numbers .
A,B and
A, B and C invested a capital in a ratio of 1/3:1/4:1/5. After 4 months A withdraws half of his capital. If the yearly profit is Rs 8470, find the share of A .
Velocity ratio 2
The ratio between the rates of walking of A and B is 2:3. If the time taken by B to cover the certain distance is 36 min, then, find the time taken by A
Spending in 3 days
Jesse spends 1/2 of his pocket money on Monday. On Tuesday, he spends 2/3 of what is left. On Wednesday, he spends 1/4 of what remains. What fraction of the pocket money does he have left?
Horses equation
Some men and equal number of horses are going somewhere. Half the sitting on the horses and rest are walking with the horses. If the number of feet on the ground is 70, how many horses are there?
Triangle 97
Triangle DEF with Ê=40°, F=90° EF = 45mm. Measure DE.
Negative degrees Celsius
From 1:00 a.m. to 10:00 a.m., the temperature dropped 7°C. From 10:00 a.m. until 4:00 p.m., the temperature then rose 15°C. From 4:00 p.m. to 10:00 p.m., the temperature then dropped 4°C. At 10:00 p.m., the temperature was −14°C. What was the temperature
Clara
Clara earned $24 for mowing her neighbor's lawn 3 times. If Clara charged the same rate and earned $32, how many times did she mow her neighbor's lawn? Use a unit rate to find the unknown value.
Cycloshop
On increasing the price of a cycle by 14%, it becomes Rs 1425. What was its original price?
Equilateral RT
On a right triangle, side a is 12, and side b is 12. What is side c?
Four plates
Four equal maximum sized circular plates are cut off from a square paper sheet of area 784 sq cm. Calculate the circumference of each plates.
Length units
How many times inch and a half go to the 12 feet?
Three in a ratio
If A is 40% more than B, B is 20% less than C then, find the ratio A : C.
School - boys:girls
In a school 10% of boy is equal to the 1/4 of number of girls and 10% of the number of girls is equal to the 1/25 of boys. Find the ratio between the number of boys and girls.
Eva wraps
Eva wraps a gift box in the shape of a right rectangular prism. The figure shows a net for the gift box. How much wrapping paper did she use, in square meters?
A solid
A solid is in the shape of a cone standing on a hemisphere with both their radii being equal to 1 cm and the height of the cone is equal to its radius. Find the volume of the solid .
Compare ratios
Is ratios 4:7 and 16:19 equivalent?
The profit 6
A man sells an article at a profit of 20%. If he had bought it at 20% less and sold for $5 less, he would have gained 25%. Find the cost price of the article.
A train 6
A train covers a distance 10km, 20km, and 30km in 50 kmph, 60 kmph and 90 kmph respectively. Find the average speed of the train (in km/h).
The surface 5
The surface area of a cylinder is 6140 cm², and the radius is 25 cm. What is the height?

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