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About this Grade 1 Adding Multiples Of 10 Drill

Adding multiples of 10 is a cornerstone skill that helps six- and seven-year-olds recognize patterns in our number system and builds mental math confidence. When children master 20 + 30 or 40 + 10, they're not just memorizing facts—they're discovering that tens work like units, which makes larger numbers feel manageable and less intimidating. This skill directly supports place value understanding, a concept central to all arithmetic in Grade 1 and beyond. Proficiency with tens also strengthens a child's ability to count efficiently and prepens them for two-digit addition and subtraction. Perhaps most importantly, it gives young learners an early win with what feels like "big number" math, boosting their confidence and curiosity about how numbers connect and work together.

What your student will practice

• Identify and skip-count by tens to build fluency with multiples of 10
• Add two multiples of 10 using place value understanding and tens columns
• Solve word problems that require adding multiples of 10 to real contexts
• Recognize that 10 + 20 and 2 tens + 1 ten represent the same value

Common mistakes to watch for

The most common error is that first-graders ignore the zero and add only the tens digits, writing 2 + 3 = 5 instead of 20 + 30 = 50. You'll spot this when a child writes the answer without the zero, or counts on their fingers as if adding single digits rather than tens. Another frequent mistake is forgetting to regroup or line up the tens place correctly, especially when sums exceed 50. Watch for students who say "fifty" but write "5" or who seem confused about whether they're adding tens or ones.