Let's subtract!
62 - 28 = ?
To subtract two-digit numbers, use column form.
Write the numbers on top of each other, like this:
Subtract one column at a time, starting with the Ones column.
What happens when the bottom digit is larger than the top digit? 🤔
👉 We regroup, or borrow.
To regroup, take 1 from the Tens column and add 10 to the Ones column.
Tip: we didn't change the value of 62. We just made it easier to work with.
It's like we split 62 into 50 + 12.
Now, we can subtract the Ones column.
12 - 8 is 4.
We write that in the Ones place below the answer line.
Next, let’s subtract the Tens.
5 - 2 is 3.
Our final answer is 34.
Great job!
31 - 15 = ?
First, let’s write the equation in column form.
Can we subtract in the Ones column?
Not yet.
We need to regroup.
Now, let’s subtract the Ones.
11 - 5 = 6.
Great job! Let’s subtract the Tens next.
2 - 1 = 1.
Awesome!
Now, complete the practice. You'll learn more and remember for longer.