# Horizontal Double-Digit Missing Back Addend

## Worksheet Description

The worksheet presented is a math exercise focused on solving for the missing addend in a series of addition problems. Each problem provides two out of three numbers in an addition equation: one addend and the sum, while the other addend is missing and represented by a blank box. Students are expected to deduce the missing number by subtracting the known addend from the sum. This format is repeated across twenty problems, with varying numbers to provide a comprehensive practice session.

The worksheet is designed to strengthen students’ understanding of the relationship between addition and subtraction, demonstrating that one operation can undo the other. This exercise helps students practice inverse operations, as they must figure out which number, when added to the given addend, will result in the given sum. It also aids in reinforcing mental arithmetic skills and the concept of balance within equations. The variety of problems encourages students to apply this skill in multiple contexts, enhancing their flexibility in thinking about numbers.

See if you can determine what is missing from that second box to create that total sum.