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Understanding Addition of Whole Numbers: Techniques for Finding Sums

This lesson focuses on the addition of whole numbers, demonstrating how to find the sum of two numbers by aligning them properly. For instance, when calculating 954 + 78, arrange the numbers with attention to the ones, tens, and hundreds places. Start by adding the ones column and moving to the left to the tens and hundreds columns. In cases of sums exceeding 9, regroup as needed. Guided practice problems reinforce understanding, allowing learners to practice addition skills with various examples.

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Understanding Addition of Whole Numbers: Techniques for Finding Sums

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  1. EXAMPLE 1 Adding Whole Numbers To find the sum 954 + 78, you line up the numbers on the ones’ place. Next you add up the ones, then the tens, then the hundreds.

  2. EXAMPLE 1 Adding Whole Numbers To find the sum 954 + 78, you line up the numbers on the ones’ place. Next you add up the ones, then the tens, then the hundreds. 954 + 78

  3. EXAMPLE 1 Adding Whole Numbers To find the sum 954 + 78, you line up the numbers on the ones’ place. Next you add up the ones, then the tens, then the hundreds. 1 954 + 78 2 4 + 8 = 12. Regroup the 12 ones as 1 ten and 2 ones.

  4. EXAMPLE 1 Adding Whole Numbers To find the sum 954 + 78, you line up the numbers on the ones’ place. Next you add up the ones, then the tens, then the hundreds. 1 1 954 + 78 1032 4 + 8 = 12. Regroup the 12 ones as 1 ten and 2 ones. 1 + 5 + 7 = 13. Regroup the 13 tens as 1 hundred and 3 tens.

  5. GUIDED PRACTICE for Example 1 Find the sum. 1. 95 + 37

  6. ANSWER 132 GUIDED PRACTICE for Example 1 Find the sum. 1. 95 + 37

  7. GUIDED PRACTICE for Example 1 Find the sum. 2. 44 + 87

  8. 2. 44 + 87 ANSWER 131 GUIDED PRACTICE for Example 1 Find the sum.

  9. GUIDED PRACTICE for Example 1 Find the sum. 406 + 95 3.

  10. ANSWER 501 GUIDED PRACTICE for Example 1 Find the sum. 406 + 95 3.

  11. GUIDED PRACTICE for Example 1 Find the sum. 4. 614 + 196

  12. ANSWER 810 GUIDED PRACTICE for Example 1 Find the sum. 4. 614 + 196

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