Addition of Two-Digit Numbers

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What is 34 + 27?
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61
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How do you add two-digit numbers?
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Align the numbers by their digits, add from right to left, carrying over if needed.
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What is the sum of 56 and 18?
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74
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What happens if the sum of the digits in a column is greater than 9?
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You carry over the extra value to the next column.
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What is 43 + 29?
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72
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If you add 50 and 50, what is your answer?
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100
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What is 67 + 15?
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82
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Why is it important to align the numbers by place value when adding?
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To ensure that each digit is in the right column for accurate addition.
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What is 24 added to 17?
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41
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How do you check your addition answer for accuracy?
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You can reverse the addition to subtraction or use estimation.
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What is 89 + 11?
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100
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What is the sum of 38 and 47?
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85
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What should you write if the total of two digits is more than 9 and has to be carried over?
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Write the ones digit in that column and carry the tens digit to the next column.
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What is 62 + 33?
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95
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Why might you use paper and pencil instead of mental math for adding larger two-digit numbers?
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Paper and pencil help keep track of carrying over and organizing numbers.
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