คำศัพท์คณิตศาสตร์
explore
Sharing your results
1. Dose the size of a number determines the number of its factors? Use examples to expain.
2. Describe the method you used to find a number that has at least 15 factors.
Extending the Activity
3. Look back at the numbers you recorded on page 94. Describe those that have an odd number of factors.
4. Define the procedure SUMODD that finds the sum of N odd numbers starting with 1. Enter SUMODD 2 to find 1+3. Then use the procedure to find the sum of the first three odd numbers, the first four odd numbers, the first five odd numbers. What pattern do you notice?
5. predict the sum of the first eleven odd numbers. Use SUMODD to check
6.What is an easy way to find the sum of the first 50 odd numbers without using the computer?
Summing Up
7. Explain how to find the sum of odds from 1 to any number.