Add 3-Digit Numbers Vertically (Carrying the 1s and 10s)
š„ The Ultimate Stack! We are adding three huge columns down, and we might have to carry a One, AND carry a Ten!
Concept
This is the exact same process you used for two-digit numbers, just with absolutely no limits on how high the answer can go. šÆ **The Double Carry Strategy:** **Example: 385 + 472 = ?** 3 8 5 + 4 7 2 --------- 1. **Ones:** 5 + 2 = 7. (No carry needed). 2. **Tens:** 8 + 7 = 15! * Write the **5** at the bottom of the Tens. * Carry the **1** to the top of the Hundreds column! Write it in a little circle. 3. **Hundreds:** Add the +1, the 3, and the 4. (1+3=4, 4+4=8). Write the 8! 4. **Answer: 857**!
Try it
Carry the cargo up the tower! **Instructions:** Add down the columns. Start on the right. Carry if the number is 10 or more! **Problem 1:** 6 2 4 + 1 9 3 --------- * Ones: 4 + 3 = ___ * Tens: 2 + 9 = 11. Write 1, carry the 1! * Hundreds: 1 + 6 + 1 = ___ * Answer: ___ **Problem 2:** (+1) 4 5 8 + 3 2 4 --------- * Ones: 8 + 4 = 12. Write 2, carry the 1! * Tens: 1 + 5 + 2 = ___ * Hundreds: ___ * Answer: ___ **Problem 3:** 5 8 9 + 2 1 1 --------- * Answer: ___ **Problem 4 (Double Carry Warning!):** 3 6 5 + 4 6 5 --------- * (Hint: 5+5=10. Carry! Then 1+6+6=13. Carry again!) * Answer: ___