Number Theory

What are the common factors of 12 and 18?

1,2,3,4

1,2,3,6

1,2,4,9

1,3,6,9

Which statement about the number 49 is true?

On the first day of school, Juan and his 2 brothers were assigned classrooms. Juan was in room 6, his older brother Luis was in room 13, and his younger brother Daniel was in room 2. Which two brothers were assigned a classroom that is a prime number?

A school nurse recorded the weight of four 2nd grade students.

Iman-51 lb

Maggie-53 lb

Henry-49 lb

Jasper- 57lb

Which student's weight is a prime number?

Tatima was asked to make a list of factor pairs for a number. She wrote the factor pairs below for the number 232.

1 x 232

2 x 116

4 x 58

8 x 29

Which of Tatima's factor pairs contains only composite numbers?

The table shows the dates of 5 holidays.

How many of the holidays are on a date that is a prime number?

What are all the common factors of 24 and 36

Which of the following figures have a prime number of sides? Select TWO correct answers.

The picture below shows the numbered doors to five room in a hotel.

Which rooms have a prime number? Select TWO correct answers.

What is the greatest common factor of 14 and 35?