Solve Vertical Addition: 921 + 79 Step-by-Step

Video Solution

Solution Steps

00:00 Solve

00:02 Each time consider combining 2 digits, and then place

00:05 Let's start by multiplying ones with ones

00:08 Place the ones, add 1 to tens

00:12 Multiply tens with tens, remember to add 1 to the calculation

00:18 Place tens in tens, add 1 to hundreds

00:21 Place 0 in the missing digits

00:24 Multiply hundreds with hundreds, remember to add 1

00:27 Place the hundreds in hundreds, add 1 to thousands

00:30 Place 0 in the missing digits

00:33 Multiply thousands with thousands, and place in thousands

00:36 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we'll follow these steps:

Step 1: Align the numbers vertically by place value.
Step 2: Add digits in each column starting from the right (units) to the left (hundreds), carrying over if necessary.
Step 3: Write the final sum at the bottom.

Let's work through the solution:

Step 1: We have the numbers aligned as:

$\begin{aligned} &921 \\ +& \\ &~~79 \\ \end{aligned}$

Step 2: Start adding from the units column:

Units: $1 + 9 = 10$ . Write 0 and carry over 1 to the tens column.
Tens: $2 + 7 + 1 \text{ (carry over)} = 10$ . Write 0 and carry over 1 to the hundreds column.
Hundreds: $9 + 1 \text{ (carry over)} = 10$ . Write 0 and carry over 1 to a new thousands column.
Thousands: No additional digits to add, so just write 1.

Step 3: Combine the results to obtain the final sum:

The sum is $1000$ .

Therefore, the solution to the problem is $1000$ .