Adding 1 and 2-digit numbers mentally (3 addends) - Exercise 1

This worksheet is designed to help second graders practice adding three one and two-digit numbers mentally. With a variety of problems, students will work on finding sums like 23 + 25 + 9 and 51 + 27 + 1. This exercise strengthens their addition skills and builds confidence in handling multiple addends. It’s a great resource for independent work, a math center, or even a quick warm-up at the beginning of a math lesson. To enhance understanding, encourage students to visualize the numbers or use manipulatives as they add, helping them grasp the concept more effectively.