3.4.A

Addition & Subtraction 3rd Grade

Texas Essential Knowledge and Skills (TEKS): 3.4.A
solve with fluency one-step and two-step problems involving addition and subtraction within 1,000 using strategies based on place value, properties of operations, and the relationship between addition and subtraction;

The sum of numbers with more than one digit can be found by adding each column from right to left, starting with the ones place.

Example:

Step 1: Write the second number under the first number so that the ones, tens, and hundreds places are lined up.

Step 2: Add the ones column (3 + 4 = 7). Write the 7 in the ones place of the sum.

Step 3: Add the tens column (5 + 7 = 12).
Since 12 has two digits, both digits won't fit in the tens place. So, write the 2 in the tens place of the sum, and carry the 1 to the hundreds column. This is called regrouping.

Step 4: Add the hundreds column (1 + 2 + 1 = 4). Write the 4 in the hundreds place of the sum.

The difference of numbers with more than one digit can be found by subtracting each column from right to left, starting with the ones place.

Example:

Step 1: Write the second number under the first number so that the ones, tens, and hundreds places are lined up.

Step 2: Look at the ones column. 3 is less than 4, so take 1 ten from the tens place, change the ten to 10 ones, and add the 10 ones to the ones place. This is called regrouping.
Then, subtract the ones column (13 - 4 = 9). Write the 9 in the ones place of the difference.

Step 3: Subtract the tens column (7 - 0 = 7). Write the 7 in the tens place of the difference.

Step 4: Subtract the hundreds column (7 - 4 = 3). Write the 3 in the hundreds place of the difference.

Addition & Subtraction

Texas Essential Knowledge and Skills (TEKS): 3.4.A

solve with fluency one-step and two-step problems involving addition and subtraction within 1,000 using strategies based on place value, properties of operations, and the relationship between addition and subtraction;

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