Factor trees for numbers up to 30 worksheets

What is on this worksheet

Finish each factor tree for a number up to 30 by writing a prime in every empty circle, then write the prime factorization.

• Numbers up to: 30

You can change any of these settings above. Press "New problems" for a fresh set with the same settings, or pick Version A to Z to print different sheets for neighboring desks. The answer key always matches.

About factor trees and prime factorization

Each factor tree is drawn with the branches already in place. Students write the prime number in each empty circle, then write the prime factorization at the bottom, smallest prime first.

Every number is split into factors in a way that always ends with the same primes, so the answer is the same however the tree is drawn. Pick how big the numbers get, from 30 up to 500.

Printing

US Letter or A4, portrait: choose your paper size above. Print at 100 percent (actual size). Use "Black and white" for the copier, or "Color" for display pages and mini books.