Subtract 667 - 89: Vertical Format Solution Guide

Video Solution

Solution Steps

00:04 Let's solve a math problem together.

00:07 First, think about subtracting two digits each time.

00:11 We see that 7 is less than 9.

00:14 So, let's borrow 1 from the tens, adding it to the ones.

00:18 This means, instead of 7, we now have 17.

00:24 Subtract the ones from 17.

00:27 Place your answer in the ones position.

00:31 Next, we see 5 is less than 8.

00:35 Again, borrow 1 from the hundreds and add it to the tens.

00:41 Now, instead of 5, we have 15.

00:45 Subtract from 15 and put the answer in tens.

00:49 Use 0 where there's no number to subtract.

00:53 Subtract hundreds from hundreds, and place the result.

00:57 And that's how we solve the problem!

Step-by-Step Solution

To solve $667 - 89$ , we perform vertical subtraction by aligning the numbers by place value:

Step 1: Start with the units column. Subtract $9$ from $7$ . Since $7 < 9$ , we need to borrow from the tens column. Change $6$ in the tens column to $5$ and add $10$ to the units column, making it $17$ . Now, subtract: $17 - 9 = 8$ .
Step 2: Move to the tens column, where we borrowed from $6$ , changing it to $5$ . Now subtract $8$ from $5$ . Since $5 < 8$ , we need to borrow from the hundreds column. Change $6$ in the hundreds column to $5$ and add $10$ to the tens column, making it $15$ . Now, subtract: $15 - 8 = 7$ .
Step 3: Finally, in the hundreds column: Subtract $0$ from $5$ , leaving $5$ .

Therefore, the solution to $667 - 89$ is $\mathbf{578}$ .

Given the multiple-choice options, the correct choice is option 2: $578$ .