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Question

Using Only Digits to Subtract with Regrouping
Subtract: 131 - 12

Write the numbers vertically.
Line these numbers up by _.
Regroup a ten to make more ones.
Our answer is _.

Answer 1

To solve the subtraction problem \( 131 - 12 \) using regrouping, we can follow these steps:

1. Write the numbers vertically, aligned by place value:

  131
-  12

2. Line these numbers up by place value, where the digits are aligned by units, tens, and hundreds.

3. Since we are subtracting 2 from 1 in the ones column and cannot do that without regrouping, we will regroup a ten from the tens place of 131 (which is 3) to make ones:

• Change the 3 in the tens place to a 2 (as we take 1 ten away).
• Add 10 to the 1 in the ones place, making it 11.

Now the numbers look like this:

  120 (the new value of 131 after regrouping)
+  11 (the new value in the ones place after regrouping)
-  12

Now we can subtract:

In the ones place:

• \( 11 - 2 = 9\)

In the tens place:

• \( 2 - 1 = 1\)

In the hundreds place:

• \( 1 - 0 = 1\)

Putting it all together, the answer is:

  131
-  12
______
  119

Our answer is 119.