Max Rescues the School Play: Adding Multiples Sprint

About this Grade 2 Adding Multiples Of 10 Drill

Adding multiples of 10 is a foundational mental math skill that second graders need to build confidence with larger numbers. When children can quickly add 10, 20, 30, or 50 to another number, they're developing number sense and preparing for two-digit addition and subtraction. This skill mirrors real-world situations—whether counting money during a school play bake sale, tracking points in games, or managing classroom supplies in groups of ten. By age 7 or 8, students' brains are ready to recognize the pattern that adding multiples of 10 only changes the tens place, leaving the ones place untouched. This insight helps them move beyond counting on fingers and toward efficient mental strategies. Mastering this skill builds automaticity, which frees up working memory for more complex math problems later on.

What your student will practice

• Recognize that multiples of 10 follow a consistent pattern in place value
• Add multiples of 10 to two-digit numbers using mental math strategies
• Explain why the ones digit stays the same when adding multiples of 10
• Solve word problems involving adding multiples of 10 to real quantities

Common mistakes to watch for

Many second graders incorrectly add the full numbers together without recognizing the place-value pattern, so they might solve 24 + 30 as 27 instead of 54. Others confuse which digit changes: they leave the tens digit alone while incorrectly modifying the ones place. Some students also struggle when the sum crosses a new ten (like 25 + 30), sometimes writing 55 instead of 55 or skipping the tens entirely. Watch for students who recount on their fingers for every problem rather than recognizing the shortcut—this signals they haven't internalized the pattern yet.