In this Grade 4 enVision Mathematics lesson from Chapter 2, students learn to add multi-digit whole numbers using two key strategies: partial sums and the standard algorithm for addition, including regrouping ones and tens. The lesson connects place-value concepts to efficient addition procedures, guiding students through step-by-step regrouping when sums exceed 9 ones or 9 tens. Practice problems and real-world word problems help students build fluency with multi-digit addition.
Section 1
Adding Whole Numbers Using Partial Sums
To add using partial sums, find the sum for each place value (ones, tens, hundreds, etc.) separately. These are the partial sums. Then, add all the partial sums together to find the final sum.
Section 2
Adding Multi-Digit Numbers
To add whole numbers:
Step 1. Write the numbers so each place value lines up vertically.
Step 2. Add the digits in each place value. Work from right to left starting with the ones place. If a sum in a place value is more than 9, carry to the next place value.
Step 3. Continue adding each place value from right to left, adding each place value and carrying if needed.
Expand to review the lesson summary and core properties.
Section 1
Adding Whole Numbers Using Partial Sums
To add using partial sums, find the sum for each place value (ones, tens, hundreds, etc.) separately. These are the partial sums. Then, add all the partial sums together to find the final sum.
Section 2
Adding Multi-Digit Numbers
To add whole numbers:
Step 1. Write the numbers so each place value lines up vertically.
Step 2. Add the digits in each place value. Work from right to left starting with the ones place. If a sum in a place value is more than 9, carry to the next place value.
Step 3. Continue adding each place value from right to left, adding each place value and carrying if needed.