Math practice for 13 year olds - page 6 of 435
Number of problems found: 8682
- Two trains 13
Two trains start at the same time toward each other from stations A and B at respective speeds of 36 km/h and 42 km/h. When they meet, it was found that one train has covered 48 km more than the other. Find the distance between the two stations. - Difference of squares
If the difference between two numbers is 3 and the difference of their squares is 39, then find the larger number. - Literacy ratio
The town's population is 311250. The ratio of women to men is 43: 40. If 24% of men and 8% of women are literate, then find the total number of literate persons in the town. - RT with rectangle
In the diagram, find the lengths h and b. One rectangle and one right triangle share one side. We know two angles and the length of the common side, as shown in the picture. - Math review
How much is 20% of 30% of 150? - Fraction of a work
Person A can do 1/2 of a piece of work in 8 days, while person B can do 1/3 of the same work in 8 days. In how many days can both do it together? - Customer 7
The customer needs a discount of 30% on the marked price. The dealer gives him two successive discounts of 20% and 12%. The discount was: (1) more than he wants (2) same as he wants (3) less than he wants (4) none of these Write the result in numbers 1 to
- The supplement
The supplement of an angle is four times its complement. Find the angle. - Minimum interior angle
What is the minimum interior angle possible for a regular polygon? - Three cubes
Three cubes of iron whose edges are 6 cm, 8 cm, and 10 cm, respectively, are melted and formed into a single cube. Find the edge of the new cube. - Cement, sand, and gravel
Concrete tiles are made using buckets of cement, sand, and gravel mixed in a ratio of 1:4:6. How many buckets of gravel are needed for 4 buckets of cement? - One-third of the sum
Some number equals 1/3 of the sum of 83.2, -25.1, and 65. What is the number? - 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 - An iron rod
If 22.5 meters of a uniform iron rod weighs 85.5 kg, what will the length of 22.8 kilograms of the same rod? - Single discount 3 What will be the single equivalent discount for successive discounts of 10%, 20%, and 15% on marked price?
- Move the average
If the average of 5 numbers is 20, the number which should be added to first number to make the average becomes 30? - 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. - One half of students
There are 1200 students in the school. Of which 600 are girls. Find the percentage of boys. - Test and exam
1100 boys and 700 girls appeared in a test. If 42% of boys and 36% of girls passed, then find the percentage of students who failed.
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