Subtract 2-Digit Vertical Numbers (With Regrouping!)
šØ The hardest trick! It's time to perform the "Borrow from the Neighbor" magic using giant 2-digit numbers entirely on paper.
Concept
This is it. The ultimate subtraction showdown. šÆ **The Two-Digit Borrowing Code:** **Example: 72 - 38 = ?** 7 2 - 3 8 -------- 1. **The Floor Check:** Are there more on the floor? Yes! 8 is bigger than 2! We must borrow. 2. **Knock Next Door:** Cross out the 7 in the Tens place. Reduce it by one to a **6**. It lent you a Ten! 3. **Gift the Ten:** Give the 10 to the 2. Cross out the 2 and write a tiny **12** above it. 4. **Subtract the Ones:** 12 - 8 = 4. (Write 4). 5. **SUBTRACT THE TENS:** The neighbor is a 6 now. We have to subtract the bottom 3 from it! 6 - 3 = 3. (Write 3). 6. **Answer:** **34**!
Try it
Knock next door and pay it back! **Instructions:** Borrow a 10. Then remember to subtract the bottom number from the NEW smaller neighbor! **Problem 1:** 6 4 - 2 9 -------- * Borrow from the 6! Make it a 5. * Give it to the 4! Make it a 14. * Ones: 14 - 9 = ___ * Tens: 5 - 2 = ___ * Answer: ___ **Problem 2:** 8 3 - 4 7 -------- * Answer: ___ **Problem 3:** 5 1 - 3 6 -------- * Answer: ___ **Problem 4:** 9 0 - 5 2 -------- * (Hint: Yes, you can borrow from a 9 to make the 0 a 10!) * Answer: ___