Curated OER
Addition-Multiple Numbers
In this addition worksheet, students complete 6 problems, adding 5 numbers together. An answer link appears at the bottom of the page.
NumberNut
Number Nut: Addition: More Than Two Addends
Explains how to add three or more multi-digit numbers.
Mr. Martini's Classroom
Mr. Martini's Classroom: Three Number Addition and Subtraction Math Quiz
Students add and subtract three numbers using this interactive quiz.