Subtract a Multiple of 100 from a 3-Digit Number
š¦ Giant leaps backward! What happens when you subtract an easy number like 400 from a messy number like 832?
Concept
Subtracting perfect hundreds is the easiest subtraction skill. šÆ **The "Hundreds Only" Shortcut:** **Example: 749 - 300 = ?** Look at the zeros. The 0 in the Tens place means the 4 is completely safe! The 0 in the Ones place means the 9 is completely safe! 1. Freeze the Tens and Ones (the "49" is frozen). 2. Subtract the Hundreds! 7 - 3 = 4. 3. Turn the frozen pieces back on. 4. **Answer: 449**! You just solved a giant math problem by just thinking "7 - 3".
Try it
Spin the dial backward! **Instructions:** The Tens and Ones digits are frozen in ice. You can only destroy the Hundreds digit! **Problem 1: 852 - 400 = ?** * Tens and Ones: "52". (Frozen!) * Hundreds: 8 - 4 = ___ * Answer: ___ **Problem 2: 619 - 200 = ?** * Answer: ___ **Problem 3: 593 - 500 = ?** * (Hint: 5 - 5 = 0. The Hundreds digit is gone entirely!) * Answer: ___ **Problem 4: 924 - 100 = ?** * Answer: ___