These 4th Grade Number & Operations in Base Ten worksheets are designed specifically to support the 4.NBT.4 standard.This set includes two individual worksheets, perfect for reviewing key skills, or assigning as reinforcement for homework. Each worksheet comes with a complete answer key. Works easily for 4th grade students, but could also accommodate high 3rd graders or lower end 5th graders. With 2 worksheets and answer keys—including a variety of word problems—these resources give students