Math Olympiad (Middle Primary)

Find the value of 1 - 2 + 3 - 4 + 5 - 6 + … + 73 - 74 + 75.

Find the missing number in 2, 2, 4, 6, 10, ( ), 26, …

How many numbers are there in the sequence below?

4, 10, 16, 22, 28, … , 64

In the following additions, each letter represents a different digit. Find ABCD.

Sandy took 4 minutes to climb the stairs from the 1st to the 3rd floor. Assuming she maintained her speed, how many minutes would it take her to climb from the 1st to the 9th floor?

In the diagram below, the topmost layer has 60 circles. How many circles are there altogether?

How many ways are there to travel from A to B, by passing through C and D?

Each distinct letter represents a unique digit in cryptarithm shown below.

Find the digit represented by M.

How many triangles are there in the figure?

Pine trees are planted at equal intervals of 16 m along a straight road, including both ends of the road. If the road is 960 m long, how many pine trees are there altogether?