Prime numbers
for 4th grade
Identify the single prime number in each of these lists
Identify prime numbers
Prime numbers are special numbers that can only be divided by 1 and the number itself without leaving a remainder. In other words, they have exactly two factors. So the number 3 is a prime number because it is divisible only by 3 and 1. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, and 19.
Many numbers are not prime, they are composite numbers - numbers that have more than two factors. These numbers can be divided by different numbers, not just 1 and themselves. For example, 4 can be divided by 1, 2, and 4.
In this topic you have to identify which of a group of numbers is a prime number. There is only one prime number in each group. The numbers in the groups range from 2 up to 60.
Related topics
Below is a table showing the first 6 question answer pairs for the topic "Prime numbers" as used in the lessons for this topic. Our games and tests for the topic use these 6 items plus 10 additional question answer pairs.
The topic "Prime numbers" is in the category Multiply + Divide for 4th grade (ages 9 to 10).
Revise 'Prime numbers' with one of our games for 4th grade
Each of our math topics for elementary are made up of between 6 and 20 question and answer pairs (both the written form and a robot voice speaking those questions and answers). Each topic can be used with all the activities on the site.
Counting * Comparing numbers * Pattern * Place value * Addition * Subtraction * Add + Subtract * Multiplication * Division * Multiply + Divide * Fractions * Decimals * Percentages * Measurements * Shapes * Position + Direction * Statistics * Algebra *
