Maths practice for 9-year-olds

Number of problems found: 432

Dilution
How many liters of water will have to be added to 1125 liters of the 45% solution of acid so that the resulting mixture will contain more than 25% but less than 30% acid content?
Electric iron
If the temperature of electric iron is 8 degree Celsius and rise by 10 degree Celsius, what is the current temperature?
The supplementary angles
Two supplementary angles differ by 50°, find the measure of each angle.
Drying fruit
Fresh fruit contains 68% water and dry fruit contains 20% water. How much dry fruit can be obtained from 100 kg of fresh fruits?
Sum of squares
If the first number is 80% of the second number and 4 times the sum of their squares is 656, find the numbers.
Squares of odd
Find the average of squares of consecutive odd numbers from 1 to 13.
Decorations 3
Each bundle has 48 red and white roses. There are 30 red roses in each bundle, and the rest are white. How many white roses are there in all?
A train 2
A train 90 meters long is moving at speed 80 km/h overtakes a second train moving at 56 km/h in the same direction and passes completely in 25 1/2 seconds. Compute how long is the second train.
Locker combination
Todd forgot the first two numbers of his locker combination. The numbers can be any number 1 through 6. What is the probability that he will guess the first number correctly and the second number incorrectly?
Earnings 4
Joey earned $35, which is five times more than Leo earned. How much did Leo earn?
Pants
Peter bought 58 pairs of pants, 18 of which were torn. How many pants were not torn, which he had?
The mean 2
The mean cost of 4 items was $39.96. The first item cost $28.50, the second item cost $41.25, and the third item cost $50. Find the cost of the fourth item.
A car 9
A car travels at 34 km/hr. How far does it take to travel in 2 hours?
The cattle
The cattle at the Howard Farm are fed 32 bales of hay each day. The horses are fed 1/2 as much hay as the cattle. How many bales of hay are the horses fed each day?
Award
Out of 36 students, 16 were awarded, 19 passed, 1 failed. Determines the percentage of honors and successful students in the class.
Arithmetic progressions.
Find the sum of all the numbers between 9 and 204, which is exactly divisible by 3.
Rita runs
Rita runs 4.18 km every day. What will be the total distance covered by Rita in 23 days?
A man 17
A man deposits 200 in his bank account every month for 11 months and then withdraws 1500. What is his bank balance?
An orange
An orange Grove has 858 trees. There are 33 rows, each with the same number of trees. How many trees are in each row
Library 4
Library A has a total collection of 250 books. Library B has 100 more books than Library A, and Library C has twice as many books as the combined number of books in Library A and B. What is the total number of books in libraries A, B and C?

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