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This Addition No Regrouping drill has 40 problems for Grade 2. St Patricks Day theme. Answer key included.
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Max discovered a magical rainbow leading to hidden gold coins. He must count them all before the leprechaun returns!
Standard: CCSS.MATH.2.NBT.B.5
Addition without regrouping is a foundational skill that builds your second grader's confidence with numbers and prepares them for more complex math. At ages 7–8, children are developing their ability to break numbers into parts and recognize place value—understanding that 23 means 2 tens and 3 ones. When students add problems like 12 + 15 or 34 + 23, they're practicing the essential habit of adding ones to ones and tens to tens separately, which makes mental math easier and faster. This skill appears constantly in daily life: counting coins at a store, combining scores in games, or organizing supplies. Mastering addition without regrouping also prevents the confusion that often happens when regrouping is introduced later. Students who are solid here move forward without the frustration of mixing up place values or forgetting to carry numbers.
The most common error is when students add the tens and ones columns but misalign their digits, writing 12 + 15 as 27 instead of 27 by accidentally treating them as single-digit problems. Another frequent mistake happens when a student adds correctly but writes the answer in the wrong place, putting ones in the tens column. Watch for hesitation or finger-counting at the ones place—this signals they haven't yet internalized basic addition facts (sums under 10), which slows down their confidence. Also notice if they say numbers out of order or skip checking their work; these are red flags that place value hasn't fully clicked.
Try a real-world counting activity at home: give your child a small pile of pennies and dimes (10–15 of each mixed together). Ask them to sort coins into piles of 10 pennies and leftover pennies, then count by tens and ones aloud together. For example, 'I have 2 dimes and 7 pennies—that's 20 and 7, or 27 total.' Then present simple problems like 'If I add 1 more dime, what's my new total?' This concrete experience with tens and ones reinforces why we add by place value, and the coins stay visible so they can touch and recount. Keep it playful—maybe even imagine you're a shopkeeper counting a St. Patrick's Day treasure chest together.