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This Adding Multiples Of 10 drill has 40 problems for Grade 2. Skyscrapers theme. Answer key included.
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Max climbs the tallest skyscraper collecting glowing gems on each floor before the lights go out!
Standard: CCSS.MATH.2.NBT.B.5
Adding multiples of 10 is a cornerstone skill that helps second graders build number sense and mental math fluency. At ages 7-8, students are developing the ability to recognize patterns and use them as shortcuts—noticing that 20 + 30 works just like 2 + 3, but with a zero attached. This skill bridges concrete counting and abstract thinking, making larger addition problems feel manageable rather than overwhelming. When children can quickly add multiples of 10, they're laying groundwork for place value understanding, regrouping in two-digit addition, and eventual multiplication. Beyond math class, this skill appears in real life: combining groups of 10 coins, tracking tens in classroom routines, or adding prices that end in zero. Mastering this concept builds confidence and reduces reliance on finger counting, freeing up mental energy for more complex problem-solving.
Many second graders treat multiples of 10 as separate digits rather than unified units, writing 30 + 40 = 70 but then doubting themselves and recounting on fingers. Another common error is losing the zero: students add 3 + 4 correctly to get 7, but forget to attach the zero, landing on 7 instead of 70. Watch for children who add the tens digit and ones digit independently without recognizing the pattern—they may write 30 + 40 = 34, confusing place value. You'll spot this mistake if a student hesitates or counts by ones instead of confidently recognizing the tens pattern.
Play a quick game at home or in the classroom: gather 10 small objects (blocks, crackers, pennies) and make piles of tens. Ask your child, 'If we have 2 piles of 10 and Dad has 3 piles of 10, how many do we have altogether?' Let them physically combine the piles first, then count by tens aloud together (10, 20, 30, 40, 50). Repeat with different numbers. This tangible connection helps cement that 20 + 30 = 50 without forcing memorization—the pattern becomes visible and automatic through play.