Using Only Digits to Subtract with Regrouping

Question

Subtract: 131 - 12
Wite the numbers vertically.
• Line these numbers up by_____

• Regroup a ten to make more
Our answer is _____

Answer 1

To subtract 131 - 12 using only digits and regrouping, we can follow these steps:

1. Write the numbers vertically:

  131
-  12

2. Line these numbers up by their place values:

   • Align the numbers according to their ones, tens, and hundreds places.

3. Regroup a ten to make more:

   • We cannot subtract 2 from 1 in the ones place. So, we need to regroup:
   • Borrow 1 from the tens place (which is 3) and convert it into ten for the ones place. This transforms the 1 in the ones place into 11 (1 + 10), and the 3 in the tens place becomes 2.

Now the numbers look like this:

  12 (this is now 11)
  120 (this is now 120 - we changed the 3)
    1
   ----

4. Subtract:
   • Now, we can subtract:
   • In the ones place: 11 - 2 = 9
   • In the tens place: 2 - 1 = 1
   • In the hundreds place: 1 - 0 = 1

Thus, the result is:

  131
-  12
-----
  119

So, our answer is 119.