Max Rescues the Rainbow Unicorns: Adding Tens Sprint

About this Grade 2 Adding Multiples Of 10 Drill

Adding multiples of 10 is a cornerstone skill that makes larger addition problems feel manageable for second graders. When children learn that 20 + 30 follows the same logic as 2 + 3, they're building mental math confidence and number sense that will serve them through division and multiplication later. This skill helps seven- and eight-year-olds recognize patterns in our base-10 number system, which is fundamental to how we count and solve problems. In everyday life, kids encounter multiples of 10 constantly—counting coins, tracking points in games, or measuring distances. Mastering this skill reduces reliance on counting on fingers and moves students toward efficient, flexible thinking. When a child can quickly add 40 + 50 without counting by ones, they've crossed an important threshold in mathematical maturity and are ready for bigger challenges ahead.

What your student will practice

• Add two multiples of 10 up to 100 with accuracy
• Recognize that 30 + 20 uses the same tens facts as 3 + 2
• Apply adding-multiples-of-10 to solve real-world word problems
• Build automaticity so answers come quickly without counting by ones

Common mistakes to watch for

Many second graders incorrectly add the tens place and ones place separately without realizing both numbers are multiples of 10. For example, they might write 30 + 20 = 50 but then second-guess themselves and recount by ones, losing confidence. Another common error is forgetting to include the zero at the end of the answer—writing 5 instead of 50. Watch for students who line up numbers incorrectly on paper, placing 30 + 20 without aligning the tens columns, which creates confusion. If your child counts on their fingers for every problem or hesitates on familiar combinations like 40 + 40, they need more practice recognizing the underlying tens pattern.