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The Floss Spelling Rule Explained

The Floss Rule is a simple spelling rule that helps students remember when to use a double consonant at the end of a word. The rule states:
• If a word has one vowel only
• The vowel is short
• Ends with f, l, s, and z
• Then double the last letter


• When the final s sounds like z don’t double it: as, is, has, was and his.
• Some common words that don’t follow the floss spelling rule include: bus, gas, pal, if, this, us, plus, and chef.