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About this Grade 1 Adding Multiples Of 10 Drill

Adding multiples of 10 is a cornerstone skill that helps first graders recognize patterns in our number system and build confidence with larger numbers. When children understand that 20 + 30 = 50, they're learning that we can count by tens the same way we count by ones—just with an extra zero. This mental math skill reduces their reliance on fingers and manipulatives, freeing up working memory for more complex math later. In everyday life, six and seven-year-olds encounter multiples of 10 through money (dimes), sports scores, and even toy collections organized in groups. Mastering this concept directly supports place value understanding and prepares students for two-digit addition and subtraction. The fluency they develop here—recognizing that the tens place does the "heavy lifting"—becomes automatic, much like remembering that a herd of horses moves as one organized group.

What your student will practice

• Recognize and add two multiples of 10 with accuracy
• Identify the pattern that adding tens means adding the tens digits only
• Build mental math speed and confidence with sums to 100
• Apply multiples-of-10 addition to word problems with one or two steps

Common mistakes to watch for

The most common error is that first graders add all the digits they see—for example, solving 20 + 30 by writing 23 or 32 instead of 50. They often forget the zero or confuse themselves by treating the tens place and ones place as separate unrelated numbers. You'll spot this when a child correctly identifies "two tens and three tens" but then writes down the individual digits (2 + 3 = 5) without understanding those tens. Another frequent mistake is reversing the digits, writing 05 instead of 50, because they haven't yet internalized that zero holds the ones place.