Vertical Double-Digit Addition Answer Key

This worksheet strengthens students’ fluency with adding eight and nine to two-digit numbers using horizontal equations. Learners compute each sum and reinforce their understanding of regrouping and place-value relationships. Consistent practice helps build accuracy and speed while supporting the transition from basic facts to multi-digit arithmetic. This worksheet encourages mental flexibility and precision, essential qualities for later mathematical problem-solving. The clear layout makes it ideal for independent practice or review sessions.

Curriculum Matched Skills

Mathematics – Place Value and Regrouping Skills

Mathematics – Addition Within 100

Mathematics – Mental and Written Computation

Mathematics – Fact Fluency Applied to Larger Numbers

This worksheet is part of our Addition Facts With 8 and 9 Worksheets collection.