Do your students ever struggle with quickly adding to important benchmark numbers? I know that my students do, and that’s why I know how important it is for students to be able to fluently add to 10, 20, and 100 without having to use their fingers or a ton of brain power. Students today are expected to be able to do math quickly and efficiently, and when students must count on their fingers their speed decreases significantly. This resource is a great way to have students practice adding these important benchmark numbers. Practice makes perfect! Included are 4 separate worksheets with keys included.