Addition ~ with regrouping

Front

What is addition with regrouping?

Back

Addition with regrouping is a method used when the sum of two digits in a column is 10 or more. You carry over the extra value to the next column.

Front

What do we do when the sum of the digits in a column is 10 or more?

Back

We regroup by carrying over the extra value to the next column on the left.

Front

What is the first step in adding two numbers with regrouping?

Back

Line up the numbers by their place values (ones, tens, hundreds, etc.).

Front

If you add 7 and 5, what do you do next?

Back

Since 7 + 5 = 12, you write down 2 and carry over 1 to the next column.

Front

What is the sum of 28 and 47?

Back

The sum is 75. (8 + 7 = 15, write 5 and carry over 1; 2 + 4 + 1 = 7).

Front

How do you add 56 and 39 using regrouping?

Back

56 + 39 = 95. (6 + 9 = 15, write 5 and carry over 1; 5 + 3 + 1 = 9).

Front

What is a carry in addition?

Back

A carry is the value that is moved to the next column when the sum of a column exceeds 9.

Front

What is the place value of the digit 3 in the number 43?

Back

The place value of 3 in 43 is 3 ones.

Front

How do you check your addition with regrouping?

Back

You can check your addition by adding the numbers again or by using subtraction to see if you get back to the original numbers.

Front

What is the sum of 123 and 456?

Back

The sum is 579. (3 + 6 = 9; 2 + 5 = 7; 1 + 4 = 5).