One Atta Time Flash Cards Distance Learning Create New Sheet Customize Problems Select a Worksheet > Version 1 Version 2 Version 3 Version 4 Version 5 Version 6 Version 7 Version 8 Version 9 Version 10 Grab 'em All Finding Missing Addend Drills Find the missing number that makes an addition sentence true.Use what you know about addition facts to solve for an unknown addend quickly.Read and solve equations with a blank or box in different positions.Build speed and accuracy with mental math when one part of the sum is missing.
