Adding two digit numbers Haibo Wei

Content area: Mathematic Grade level: 4 Summary: the purpose of this power point is to give the students the ability to learn how to using the standard algorithm add 2 multi digit whole numbers. Learning Objective: given an equation, the students will be able to using the standard algorithm accurately add them together with 100% accuracy. Content Standard: Number& Operations in Base Ten.

Adding two digit numbers without regrouping To add 2-digit numbers without regrouping, follow steps: Add the numbers in the ones place. Then add the numbers in the tens place. Ten’sOne’s Ten’sOne’s

Adding two digit numbers with regrouping To add 2-digit numbers, add the ones digit and regroup the digit whose sum is more than ten to the tens place, then add the tens digit. Let us see with the help of example how to regroup when adding two digit numbers. Ten’sOne’s Ten’sOne’s

Let’s practice 32+23= A. 55 B. 45 C. 65 D. 75

Wonderful You did a great job! You addition this problem correctly!

56+47= A. 113 B. 123 C. 103 D. 133

Excellent You did a great job! You solve this problem correctly!

65+46= A. 105 B. 111 C. 101 D.110

You did it ! Great job! You chose a correct answer.

Summary In this lesson you learned: using the standard algorithm fluently add 2-digit whole numbers to 2-digit whole numbers without regroup using the standard algorithm fluently add 2-digit whole numbers to 2-digit whole numbers with regroup Do exercise based on above two methods.

Conclusion Add is normally used in their life. We have learned using the standard algorithm adding 2-digit whole numbers to 2-digit whole numbers with and without regroup. Keep practice. This knowledge will help you solve a lot of problem in your life.

Uh Oh! To add 2-digit numbers without regrouping, follow steps: Add the numbers in the ones place. Then add the numbers in the tens place. To add 2-digit numbers, add the ones digit and regroup the digit whose sum is more than ten to the tens place, then add the tens digit. Let us see with the help of example how to regroup when adding two digit numbers. Lets relook at how we addition: