Curated OER
Addition: Fill in the Missing Addend
In this addition worksheet, students fill in a missing addend to arrive at a given sum, 7 problems total. A reference web site is given for additional activities.
Curated OER
Missing Addends
In this missing addends worksheet, students fill in one missing addend in a problem to arrive at the sum of 20, 5 problems total. An answer key is included.