Practice Exercises for Number Theory

Directions: Read each question below. Click once in an ANSWER BOX and type in your answer; then click ENTER. Do not enter commas in your answers. After you click ENTER, a message will appear in the RESULTS BOX to indicate whether your answer is correct or incorrect. To start over, click CLEAR.

1.	Find the greatest common factor of 28 and 72. ANSWER BOX: GCF = RESULTS BOX:

2.	Find the least common multiple of 15 and 25. ANSWER BOX: LCM = RESULTS BOX:

3.	Name one prime number from 80 to 89. ANSWER BOX: RESULTS BOX:

4.	The number 91 is composite. Name a number other than 1 and itself that is a factor of 91. ANSWER BOX: RESULTS BOX:

5.	Which number is divisible by 3? 49, 87, 103, 119 ANSWER BOX: RESULTS BOX:

6.	Which number is divisible by 8? 1821, 1496, 1246, 1586, 1634 ANSWER BOX: RESULTS BOX:

7.	Write fourteen squared in standard form. ANSWER BOX: RESULTS BOX:

8.	Write nine cubed in standard form. ANSWER BOX: RESULTS BOX:

9.	The numbers 1, 8, 64, 512, … are each powers of 8. What is the next number in the list? ANSWER BOX: RESULTS BOX:

10.

If five to the fourth power is 625, then what is five raised to the fifth power?