Counting Problems( Week 33 Evaluation) 1. There are 13 rungs on a ladder. Susan is on the 2nd rung and Eric is on the 7th rung. How many steps is Susan apart from Eric? 2. A team T-shirts are numbered from 3 to 27 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. 50 boys stand in a line. There is a girl between each pair of boys. How many girls are there in the line? 4. Cut a strip of wire into 26 pieces. How many cuts need to be made? 5. If you write down the numbers from 32 to 52 inclusively. How many of them are odd numbers? 6. A group of students lined up. There are 8 students ahead of Andy, and 6 students behind him. How many students are there together? 7. A group of students lined up. Counting from left to right, Nick is the 17th in line; counting from right to left, Nick is the 3rd. 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 3 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? |