Double Digit Subtraction in your head

Front

What is double digit subtraction?

Back

Double digit subtraction is the process of subtracting numbers that have two digits, such as 24 - 10 or 72 - 10.

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CCSS.7.NS.A.1C

Front

What is the result of 24 - 10?

Back

14

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CCSS.2.OA.A.1

Front

What is the result of 72 - 10?

Back

62

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CCSS.2.NBT.B.5

Front

What is the result of 50 - 25?

Back

25

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CCSS.2.NBT.B.5

Front

What is the result of 100 - 10?

Back

90

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CCSS.1.NBT.C.5

Front

What is the result of 42 - 32?

Back

10

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CCSS.1.NBT.C.4

CCSS.2.MD.B.6

Front

How do you subtract 10 from a number?

Back

To subtract 10 from a number, simply take away 1 from the tens place and keep the units place the same.

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CCSS.1.NBT.C.5

Front

What is the difference between 50 and 25?

Back

The difference between 50 and 25 is 25.

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CCSS.2.OA.A.1

Front

If you have 72 and you take away 10, how much do you have left?

Back

If you take away 10 from 72, you have 62 left.

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CCSS.1.NBT.C.5

Front

What is the first step in double digit subtraction?

Back

The first step is to line up the numbers vertically by their place values.

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CCSS.5.NBT.B.7