Double digit addition is when you add two numbers both with two digits. It's important to line up the digits in each number before adding. Remember to add the digits in the ones column first, then the tens column.
Double Digit Addition
Addends – The numbers being added together. Sum – The answer to an addition problem. Plus Sign (+) – A sign used to represent addition.
In the early 1900s, people used a device called a comptometer to help with double digit addition. Double digit addition is one of the oldest forms of math. It has been around since the times of ancient Greece. The most efficient way to solve double digit addition problems is to use the standard algorithm, which was developed by Gottfried Wilhelm Leibniz in the 17th century.
Did you know?
How can you use addition to solve a problem involving two-digit numbers?
What strategies can you use to help you solve double digit addition problems?
What strategies did you use to solve the double digit addition problem?
How did you feel when you successfully completed the double digit addition problem?
Brain break: Draw a walking sandwich with legs and arms, enjoying a picnic in a park
Question: What is the sum of 15 and 32? Clues: • The first number has two digits. • Add the numbers in the ones place first. • Then add the numbers in the tens place. In pairs: Select and solve one of the tasks: A. Work in pairs to solve the problem using a drawing. B. Explain your solution to the class.
What is the sum of 12 + 14?
What is the sum of 34 + 21?
What is the sum of 47 + 19?
What is the sum of 56 + 38?
What is the sum of 29+47?
Work together in pairs: What is the sum of 18 + 19?