Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to do a factor tree [title] Write the number at the top of your paper. [step] When you need to build a factor tree for a particular number, you need to start by writing that number at the top of the paper. This will be the tip of your tree.

Ending1: [substeps] Prepare the tree for its factors by drawing two downward diagonal lines beneath the number. One should point left and the other should point right. Ending2: [title] Write your significant other's number at the top of your paper. [step] Make sure to write the number at the top of your paper on a gray background. Ending3: Some ways to do this are : [substeps] Name your tree by its main word, then come up with your tree's principal word. The main word is probably the most acceptable word you can think of, and often makes the most sense in the context of an article. Ending4: This will be your final step to building the factor tree. [title] Create notes about the reasons why that number is important.

Answer format: ending1/ending2/ending3/ending4