Subtraction with regrouping

Front

What is subtraction with regrouping?

Back

Subtraction with regrouping is a method used to subtract numbers when the top digit is smaller than the bottom digit in any column, requiring borrowing from the next column.

Tags

CCSS.7.NS.A.1C

Front

How do you perform subtraction with regrouping?

Back

1. Start from the rightmost column. 2. If the top digit is smaller than the bottom digit, borrow from the next column to the left. 3. Subtract the digits in each column, moving left.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the result of 205 - 15?

Back

190

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the result of 73 - 27?

Back

46

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the result of 528 - 173?

Back

355

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the result of 407 - 188?

Back

219

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the result of 409 - 319?

Back

90

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What does it mean to 'borrow' in subtraction?

Back

To 'borrow' means to take 1 from the next higher place value to help subtract a smaller digit from a larger digit in the current column.

Tags

CCSS.7.NS.A.1C

Front

Why is regrouping necessary in subtraction?

Back

Regrouping is necessary when the digit in the minuend (top number) is smaller than the digit in the subtrahend (bottom number) in any column.

Tags

CCSS.2.NBT.B.7

Front

What is the first step in solving a subtraction problem with regrouping?

Back

Identify the rightmost column and check if the top digit is smaller than the bottom digit.

Tags

CCSS.7.NS.A.1C