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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Corn Maze theme. Answer key included.
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Max discovers a mysterious path through the towering corn. He must solve each addition puzzle to escape before dark!
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that helps second graders build mental math fluency and number sense. When children can quickly add 20 + 30 or 40 + 50, they're not just memorizing facts—they're learning how our base-10 number system works. This foundation makes it easier to tackle two-digit addition later on, where breaking numbers into tens and ones becomes essential. At seven and eight years old, students' brains are developing the ability to recognize patterns and shortcuts, and multiples of 10 are the most obvious pattern in mathematics. Mastering this skill also builds confidence; students feel smart when they can solve 10 + 10 + 10 instantly, which motivates them to tackle harder problems. Plus, in real life—counting money, measuring ingredients, or keeping score in games—adding tens happens constantly.
The most common error is when students revert to counting by ones instead of thinking in tens. You'll see a child count "30, 31, 32..." instead of "30, 40, 50." Another frequent mistake happens when students write the ones place incorrectly—answering 20 + 30 = 5 instead of 50, because they only added the first digits. Some students also struggle when problems mix multiples of 10 with single-digit numbers (like 20 + 7), confusing themselves about where the ones go. Watch for hesitation or finger counting as red flags that the tens concept hasn't clicked yet.
Play a simple store game at home: give your child play money or real coins in dimes, and ask them to figure out the total cost of two items priced in multiples of 10 cents (20¢, 30¢, 40¢). For example, "If this apple costs 30¢ and this banana costs 20¢, how much money do you need?" Let them count out the dimes physically first, then challenge them to answer without touching the coins. This real transaction context makes the abstract math concrete and memorable for seven-year-olds.