Straight Line Sums: 3-Digit Addition Practice !

In this worksheet, you'll add two numbers written side-by-side, horizontally. With numbers up to 999, you'll strengthen your speed, attention to place value, and overall arithmetic fluency.

Skills You Build:

• Performing horizontal 3-digit addition

• Developing number alignment mentally

• Strengthening place value skills

• Practicing attention to detail

• Building math confidence