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Spelling Rules: The Floss Rule

Why do some words have a double consonant at the end while others don’t? Here’s the answer.

a tooth looking at words with double consonants f, l, and s

Have you ever wondered why some words have a double consonant at the end (such as sniff), while other words do not (such as dog and bat)?

The answer is easy–and we call it The Floss Rule. It’s a really simple spelling rule that helps kids remember when to use a double consonant at the end of a word.

Check out this handy rule in the video below, and then read on for free printable spelling rule posters and a sample lesson!

Why Do We Call It “The Floss Rule”?

The rule states that if a word has only one vowel and ends in F, L, or S, double the last letter.

The word floss is a perfect example of this rule, and it also contains the letters f, l, and s! That makes “The Floss Rule” a pretty handy name, doesn’t it?

infographic showing the floss rule for spelling

More tips and tricks like this one are taught throughout the All About Spelling program. Want to see more? Download these two free resources to see just how easy teaching spelling rules can be.

Download All About Spelling Level 1, Lesson 17.
This lesson shows how we teach doubling a consonant at the end of one-syllable words.

pdf-icon-transparent-background2-small-p3

Download our free Spelling Rules Posters.
This handy resource will help make learning three important spelling rules easy and fun to remember for your children.

Has the Floss Rule helped your child? I would love to hear about it in the comments below! And check out our other spelling rules, too!

About the author

Marie Rippel

Marie Rippel, curriculum developer of the award-winning All About Reading and All About Spelling programs, is known for taking the struggle out of both teaching and learning. Marie is an Orton-Gillingham practitioner, sought-after speaker, and member of the International Dyslexia Association. When not writing or teaching, Marie can be found riding her Icelandic horses.

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