Max Rescues Penguins: Glacier Addition Challenge!

About this Grade 3 3 Digit Addition Drill

Three-digit addition is a cornerstone skill that helps your child build confidence with larger numbers they encounter every day—from reading page numbers in chapter books to calculating allowance amounts. At ages 8-9, students are developing the mental stamina and organizational strategies needed to manage multi-step math problems, skills that transfer directly to reading comprehension, following instructions, and problem-solving in science. Mastering 3-digit addition requires understanding place value (ones, tens, hundreds) at a deeper level, which becomes the foundation for subtraction, multiplication, and division in later grades. When students can add 247 + 135 fluently, they're not just memorizing; they're learning to break apart numbers strategically and track regrouping (or "carrying") with accuracy. This drill builds both procedural fluency and number sense—the ability to estimate and recognize when an answer makes sense, much like estimating how thick a glacier is before measuring it precisely.

What your student will practice

• Add two 3-digit numbers with regrouping in the ones and tens places
• Understand and apply place value to align digits correctly before adding
• Regroup (carry) accurately from ones to tens and tens to hundreds
• Verify answers using estimation and place-value reasoning

Common mistakes to watch for

The most common error is misaligning digits—students write 247 + 35 as if the 3 and 5 belong in the ones column, resulting in incorrect sums. Another frequent mistake is forgetting to regroup or writing the regrouped ten in the wrong position; for example, adding 167 + 145 and forgetting to carry the 1 from the ones column to the tens place. Watch for students who regroup correctly but then forget to add the carried digit—they add 6 + 4 = 10 but then only write the 0 instead of adding that 1 to the tens column.