Mastering Two-Digit Addition and Subtraction

Front

What is the result of adding two two-digit numbers?

Back

The result is the sum of the two numbers, which can be calculated by aligning the numbers vertically and adding each column, carrying over if necessary.

Front

How do you subtract a two-digit number from another two-digit number?

Back

To subtract, align the numbers vertically, subtract each column starting from the right, and borrow from the next column if needed.

Front

What is the sum of 55 and 38?

Back

93

Front

If you have 90 stickers and give away 45, how many do you have left?

Back

You have 45 stickers left.

Front

What is the sum of 34 and 47?

Back

The sum is 91.

Front

What is the total when you add 23 apples and 19 more apples?

Back

The total is 42 apples.

Front

What is the importance of carrying in addition?

Back

Carrying is important when the sum of a column exceeds 9, as it affects the next column's total.

Front

What does it mean to borrow in subtraction?

Back

Borrowing is the process of taking 1 from the next left column when the top number is smaller than the bottom number in a subtraction problem.

Front

How can you check your addition?

Back

You can check your addition by reversing the operation (subtracting the second number from the sum) to see if you get the first number.

Front

What is a two-digit number?

Back

A two-digit number is any number from 10 to 99.