Open Middle®
Directions: Using the digits 1-9 at most one time each, find the closest difference to 200.
Hint
How can you rearrange the digits to get even closer to 200?
Which place value is most helpful to think about? Why?
What other solutions can you find?
Is it possible to get exactly 200?
Which place value is most helpful to think about? Why?
What other solutions can you find?
Is it possible to get exactly 200?
Answer
202 = 631-429 or 202 = 471-269 202=731-529
198 = 829 – 631, 198 = 849 – 651, 198 = 459 – 261, 198 = 839 – 641, 198 = 739 – 541, 198 = 679 – 481
198 = 829 – 631, 198 = 849 – 651, 198 = 459 – 261, 198 = 839 – 641, 198 = 739 – 541, 198 = 679 – 481
Source: Jessica Goree
357 – 168 = 199