Counting Problems( Week 33 Evaluation) 1. There are 16 rungs on a ladder. Hillary is on the 3rd rung and Rene is on the 11th rung. How many steps is Hillary apart from Rene? 2. A team T-shirts are numbered from 11 to 39 consecutively. All the even number T-shirts are assigned to group A and all the odd number T-shirts are assigned to group B. How many people are there in group B? 3. 42 girls stand in a line. There is a boy between each pair of girls. How many boys are there in the line? 4. Cut a strip of wire into 22 pieces. How many cuts need to be made? 5. If you write down the numbers from 41 to 63 inclusively. How many of them are even numbers? 6. A group of students lined up. There are 4 students ahead of Tom, and 6 students behind him. How many students are there together? 7. A group of students lined up. Counting from left to right, Julia is the 9th in line; counting from right to left, Julia is the 10th. How many students are there in total? 8. How many triangles can you count in the figure below?
9. There are 4 brothers in a family and each of them has 4 sisters and 3 brothers. How many kids are there in this family? 10. How many different line segments can you count in the following figure? |