Addition is an operation used to calculate the total or sum of two or more numbers.
Addition combines two quantities into a single quantity.
Numbers that are added together are called addends, and the total is called the sum.
We can add 3-digit numbers in the same manner as we add 2-digit or single digit numbers.
Addition on Number Line
Addition is easy to understand on number line.
Step 1: First, place the first number on the number line.
Step 2: Express the second number in expanded from.
Step 3: Now, proceed through the number line according to the expanded form of the second number from the first number.
Step 4: The last point that we reach is the sum of the two numbers.
Example:Add 242 and 126 using number line.
Answer: 242 + 126 = 242 + 100 + 20 + 6
242 + 126 = 368
Addition of 3-digit Numbers Without Carry Over
Step 1: Start adding digits from ones place.
Step 2: Add the digits at tens place.
Step 3:Add the digits at hundreds place.
Add: a) 356 + 443 b) 145 + 623 + 211
Addition of 3-digit Numbers with Carry Over
Step 1: Start adding digits from ones place. If there is any carry-over, then add the number of the carry forward with the digits at tens place.
Step 2: Add the digits at tens place. If there is any carry-over, then add the number of the carry forward with the digits at hundreds place.
Step 3:Add the digits at the hundreds place.
Add: a) 356 + 465 b) 149 + 385 + 676
Following are the steps to solve a word-problems involving addition
Step 1: Read the question carefully and identify the numbers to be added to get the total.
Step 2: Add the numbers to find the sum.
Step 3:One final sentence should be there at the end of the solution which concludes the result.
a) On the sports day of a school, 120 students participated in a 100-metre race, 164 students participated in the Spoon race, and 56 students participated in the sack race. How many students participated in all?
The number of students who participated in the 100- metre race = 120
The number of students who participated in the Spoon Race = 164
The number of students who participated in the Sack Race = 56
The total number of students who participated in the Sports day events =
120 + 164 + 56 = 340
Hence, 340 students participated in all.
b) At a school picnic, there were 250 girls and 234 boys. How many students went to the picnic?
The number of girls who went to the picnic = 250
The number of boys who went to the picnic = 234
So, the total number of students who went to the picnic is:
250 + 234 = 484
Hence, 484 students went to the picnic.