Double Digit Addition and Subtraction

What is double digit addition?

• The process of adding two single-digit numbers.

• The process of adding two numbers that each have two digits, resulting in a sum that may also be a two-digit or three-digit number.

• The process of subtracting two two-digit numbers.

• The process of multiplying two two-digit numbers.

What strategies can be used to solve double digit addition problems?

• Using number lines, breaking numbers into tens and ones, and using mental math.

• Only using calculators for addition problems.

• Memorizing all double digit sums by heart.

• Ignoring the tens place and only adding the ones place.

What is double digit subtraction?

• The process of adding two two-digit numbers together.

• The process of subtracting one two-digit number from another two-digit number, resulting in a difference that may also be a two-digit or one-digit number.

• The process of multiplying two two-digit numbers together.

• The process of dividing one two-digit number by another two-digit number.

Why is it important to understand place value in addition and subtraction?

• It helps in correctly aligning numbers and performing operations accurately.

• It allows for faster calculations without the need for accuracy.

• It is only necessary for multiplication and division operations.

• It simplifies the process of memorizing numbers.

How do you add two-digit numbers?

• Align the numbers by place value and add the ones column first, then the tens column.

• Add the numbers in any order without considering place value.

• Multiply the two-digit numbers and then add the result to the first number.

• Subtract the smaller number from the larger number.

If McKenzie had 24 cookies and made 31 more, how many cookies does she have now?

• 50 cookies

• 52 cookies

• 55 cookies

• 60 cookies

How do you subtract two-digit numbers?

• Align the numbers by place value, subtract the ones column first, borrow from the tens column if necessary, and then subtract the tens column.

• Subtract the tens column first, then the ones column, without borrowing.

• Add the two-digit numbers together and then subtract from 100.

• Align the numbers by place value and subtract the larger number from the smaller number.

What is carrying in addition?

• Carrying in addition occurs when the sum of a column exceeds 9, requiring the excess to be carried over to the next column.

• Carrying in addition is the process of adding two numbers without any need for carrying over.

• Carrying in addition refers to the practice of ignoring the sum of a column if it exceeds 9.

• Carrying in addition is a method used to simplify complex addition problems.

How can estimation be used in double digit addition and subtraction?

• By rounding numbers to the nearest ten to quickly assess the reasonableness of an answer.

• By calculating the exact answer without any rounding.

• By ignoring the tens place and only focusing on the units place.

• By using a calculator to find the answer.

What is an application-based question in math?

• A question that tests basic arithmetic skills.

• A problem that requires the application of mathematical concepts to solve real-world scenarios.

• A question that focuses on theoretical math concepts.

• A question that can be answered without any mathematical calculations.