Grade 4 Math worksheet: Addition with missing addend (sum under 100 ... Below are six versions of our grade 4 math worksheet; the students must find the missing number in each addition equation. These worksheets are pdf files. Worksheet #1 Worksheet #2 Worksheet #3 Worksheet #4 Worksheet #5 Worksheet #6 5 More Similar: Addition with missing number (sum under 1,000) Adding three 2-digit numbers More addition worksheets