2-Digit Addition with Regrouping

Front

What is 2-digit addition with regrouping?

Back

2-digit addition with regrouping is a method used to add two numbers that are both two digits long, where the sum of the digits in a column exceeds 9, requiring a carry to the next column.

Front

How do you perform 2-digit addition without regrouping?

Back

To perform 2-digit addition without regrouping, simply add the digits in each column (ones and tens) without carrying over any value to the next column.

Front

What is the first step in 2-digit addition with regrouping?

Back

The first step is to align the numbers by their place values (ones under ones, tens under tens) and start adding from the rightmost column.

Front

What do you do if the sum of the ones column exceeds 9?

Back

If the sum of the ones column exceeds 9, you write down the last digit of the sum and carry over the tens digit to the next column.

Front

In the problem 21 + 47, what is the sum of the ones place?

Back

In the problem 21 + 47, the sum of the ones place is 1 + 7 = 8.

Front

In the problem 21 + 47, what is the sum of the tens place after regrouping?

Back

In the problem 21 + 47, after carrying over, the sum of the tens place is 2 + 4 + 1 (from the carry) = 7.

Front

What is the total when adding 63 + 25?

Back

The total when adding 63 + 25 is 88.

Front

How do you solve word problems involving addition?

Back

To solve word problems involving addition, identify the quantities involved, translate the words into a mathematical equation, and then perform the addition.

Front

If John has 34 erasers and 21 pencils, how do you find the total number of items?

Back

To find the total number of items, add the number of erasers and pencils: 34 + 21 = 55.

Front

What is the importance of regrouping in addition?

Back

Regrouping is important in addition because it allows for accurate calculations when the sum of digits exceeds the base value (10 in decimal), ensuring correct place value.