Subtract 3-Digit Numbers Vertically (With Borrowing)
š„ Stack Em and Borrow! The rhyme is back. "More on top? No need to stop! More on the floor? Go next door!"
Concept
This is the King of all subtraction methods. It can solve any number in the universe. šÆ **The Stacking Code:** **Example: 832 - 156 = ?** 8 3 2 - 1 5 6 --------- 1. **Ones Floor Check:** 2 < 6. Go next door! * Cross out 3. Make it 2. * Give 10 to the 2. (Make it 12). * 12 - 6 = **6**. 2. **Tens Floor Check:** The new number is a 2. The bottom number is a 5. (2 < 5). Go next door AGAIN! * Look at the 8 in the Hundreds. Cross it out. Make it a 7. * Give the ten to the 2. (Make it a 12). * 12 - 5 = **7**. 3. **Hundreds Check:** 7 - 1 = **6**. 4. **Answer:** **676**!
Try it
Knock next door ... twice! **Instructions:** Start on the Ones. Ask the rhyme! Do it again for the Tens! **Problem 1:** 5 4 1 - 2 1 8 --------- * Ones: Borrow from the 4! (It becomes 3). 1 becomes 11. (11 - 8 = ___). * Tens: 3 - 1 = ___. (No borrowing needed here!). * Hundreds: 5 - 2 = ___. * Answer: ___ **Problem 2:** 7 2 5 - 3 6 1 --------- * (Hint: You have to borrow from the 7 to help the Tens column!). * Answer: ___ **Problem 3:** 9 4 3 - 4 8 5 --------- * (Hint: Double borrowing required!) * Answer: ___