Max Conquers the Playground: Collect Tens Challenge!

About this Grade 1 Adding Multiples Of 10 Drill

Adding multiples of 10 is a cornerstone skill that helps first graders see patterns in our number system and builds confidence with mental math. When children grasp that 20 + 30 = 50, they're learning that tens can be counted just like ones—a big conceptual leap at age 6 and 7. This skill directly supports place value understanding, which is essential for all future addition and subtraction. Beyond math class, kids use this thinking when counting money, keeping score at the playground, or figuring out how many items come in packs. Mastering multiples of 10 also reduces reliance on counting on fingers, freeing up mental energy for more complex problems. By practicing these patterns now, your child builds the foundation for two-digit addition and stronger number sense that will carry them through elementary math.

What your student will practice

• Recognize and count by tens to fluently add two multiples of 10
• Apply place value understanding to explain why 10 + 20 = 30
• Solve missing-addend problems with multiples of 10
• Transfer ten-addition patterns to real-world scenarios with groups of 10

Common mistakes to watch for

The most common error is when children add the tens digits but ignore the zero at the end—for example, solving 20 + 30 as 2 + 3 = 5 instead of 50. You'll spot this when they write just "5" or "23" instead of "50." Another frequent mistake is reversing digits or confusing which number goes where, especially in horizontal format. Watch for hesitation or counting on fingers from 1 instead of using the tens pattern; this signals the student hasn't yet internalized that two tens plus three tens makes five tens.