Maths practice for 12-year-olds - page 4 of 362
Number of problems found: 7228
- One-third of the sum
Some number equals 1/3 of the sum of 83.2, -25.1, and 65. What is the number? - The ratio 20
The ratio of the boys to the girls is 1:3. There are 20 pupils. How many boys and how many girls are there? - A capsule
A medicine capsule is a cylinder with two hemispheres stuck to each end. Its length is 14 mm, and its diameter is 5 mm. Find its surface area. - Divisor of two numbers Find the (greatest common) divisor of 18 and 45.
- Jeremy 2
Jeremy is digitally editing out some red-eye problems in the photos from his sister's birthday party. The eyes are small and hard to click on, so he zooms in on the photo from 100% to 400%. In the zoomed-in photo, the eyes are 3 cm wide. How many cm wide - Deli meat
Mrs. Matthews buys deli meat for her kids' lunches every week. This week she buys 3.75 pounds of ham. How many sandwiches can she make if she uses 0.25 pounds of ham for each sandwich? - Four fractions
There are four fractions: 5/8, 7/12, 1/3, and 2/5. Find the difference between the largest and the smallest fraction.
- A baker 6
A baker prepares a cake mix that weighs 120 pounds. The cake mix consists of 25 1/2 pounds of flour, 32 3/4 pounds of sugar, 20 3/8 pounds of milk, 15 pounds of whole eggs, and a total of 7 1/4 pounds of miscellaneous ingredients. The only other ingredien - A circular track
The inner circumference of a circular track is 220 m, and the width of the track is 7 m. Calculate the cost of putting up a fence along the outer circle at the rate of 50 USD/m. - Temperature bellow zero
At 3 PM, the temperature was 12 F. It then began dropping 2 F every hour for 7 hours. What was the temperature after 7 hours? - Chocolate bars Share 26 chocolate bars among 3 friends so that they all get the same amount of chocolate bar and there is nothing left over. How many chocolate bars will each friend get?
- Slab of a chocolate Albany has 3/4 of a slab of chocolate he gives 2/5 of the slab to her friend Peter. How much chocolate does she have left?
- A tank 3
A tank is 3/5 full of water. 50 liters more of water is required to fill the tank, how many liters of water can the tank hold? - Interior angles 4
How many degrees are in the sum of the interior angles of a quadrilateral? - 15 years
15 years hence, a man will be just 4 times as old as he was 15 years ago. Find his present age.
- Time and distance
A man walking at a speed of 4 km/h can reach a destination in 3 hours. If he increases his speed by 1 km/h, how much time will he save? - A community event
Ana is organizing a community event in San Jose. If each participant gets 3/4 of a sandwich and there are 12 participants, how many sandwiches does Ana need in total? - The sum 49 The sum of two rational numbers is -5. If one of them is -13/6, find the other.
- The average 16
The average of 50 numbers is 38. If the two numbers 45 and 55 are not considered, what will be the average of remaining numbers? - Freezing
A certain freezing process requires that room temperature be lowered from 40°C at the rate of 5°C per hour.What will be the room temperature 12 hours after the process begins?
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