2 Digit Addition For Kids: Add Ones, Then Tens
2 digit addition is easiest when you break each number into tens and ones. First add the ones place, then add the tens place. If the ones add to 10 or more, regroup that extra ten before finishing. This simple place-value method works for problems with no carrying and for problems that do need regrouping.
Add Ones First
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Start by lining up the numbers so tens are over tens and ones are over ones. Add the ones digits first because that tells you whether regrouping is needed. For example, 23 + 14 means 3 ones + 4 ones = 7 ones. Then add the tens: 2 tens + 1 ten = 3 tens. The answer is 37. Checking by place value helps keep the steps clear.
When Regrouping Happens
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Sometimes the ones digits make 10 or more. In 28 + 15, add the ones first: 8 + 5 = 13. Write 3 in the ones place and regroup the extra 10 as 1 ten. Then add the tens: 2 tens + 1 ten + 1 regrouped ten = 4 tens. The answer is 43. Regrouping is just trading 10 ones for 1 ten, which keeps the place value correct.
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Try 41 + 26. Add the ones: 1 + 6 = 7, so no regrouping is needed. Add the tens: 4 + 2 = 6 tens. The answer is 67. To check, split the answer into 60 and 7, then recombine 60 + 7 = 67. Whether the problem is simple or needs regrouping, the same order always helps: ones first, then tens, with a final check by place value.
source: math-drills.com
