2 Digit Addition and Subtraction with Estimation

Front

What is 2-digit addition?

Back

2-digit addition is the process of adding two numbers that each have two digits, such as 23 + 45.

Front

What is 2-digit subtraction?

Back

2-digit subtraction is the process of subtracting one 2-digit number from another, like 67 - 34.

Front

What does 'estimate' mean in math?

Back

To estimate means to find a number that is close to the exact answer, often by rounding.

Front

How do you estimate the sum of 46 + 32?

Back

Round 46 to 50 and 32 to 30. Then, 50 + 30 = 80.

Front

How do you estimate the difference of 98 - 23?

Back

Round 98 to 100 and 23 to 20. Then, 100 - 20 = 80.

Front

What is the sum of 46 + 32?

Back

The sum of 46 + 32 is 78.

Front

What is the difference of 75 - 29?

Back

The difference of 75 - 29 is 46.

Front

What is the difference of 47 - 23?

Back

The difference of 47 - 23 is 24.

Front

What is the difference of 52 - 35?

Back

The difference of 52 - 35 is 17.

Front

What is the first step in 2-digit addition?

Back

The first step is to add the digits in the ones place.