Double Digit Addition

Front

What is double digit addition?

Back

Double digit addition is the process of adding two numbers that each have two digits, such as 38 and 42.

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Front

What is the sum of 38 and 42?

Back

80

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Front

What is the sum of 38 and 16?

Back

54

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Front

What is the sum of 26 and 58?

Back

84

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Front

What is the sum of 12 and 59?

Back

71

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Front

What is the sum of 25 and 36?

Back

61

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Front

How do you add two double digit numbers?

Back

Line up the numbers by place value (tens and ones), add the ones column, then the tens column, carrying over if needed.

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Front

What do you do if the sum of the ones column is 10 or more?

Back

You carry over 1 to the tens column.

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CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

Front

What is carrying in addition?

Back

Carrying is when you move a value from one column to the next when the sum exceeds the base value (like 10 in base 10).

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CCSS.2.NBT.B.7

Front

What is a place value?

Back

Place value is the value of a digit based on its position in a number, such as tens or ones.

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CCSS.4.NBT.A.1