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You add two-digit numbers by working with the ones first and then the tens. If the ones make 10 or more, you carry one ten to the next place so your answer is correct.
You should be comfortable with counting forward and recognising tens and ones in two-digit numbers. It also helps to know basic addition facts within 10.
One question from this skill's own question bank, shown with its full working.
27 + 15 = ?
Working: 7 + 5 = 12, write 2 carry 1; 2 + 1 + 1 = 4, so 42.
This usually appears in Lower Primary when learners move from simple addition to column addition with carrying. It supports classwork, school-based continuous assessment, and end-of-term tests.
Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.
Other Lower Primary Operations skills in Maths, at the same point in the course.
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