Number play

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Across
  1. 3. Changing a number to make it simpler
  2. 5. The number system used around the world with thousands and millions
  3. 6. A number that reads the same backward and forward
  4. 7. The number system used in India with lakhs and crores
  5. 8. A smart guess! You don’t need the exact number
  6. 9. The biggest number you can think of (or write with the digits you have) SMALLESTNUMBER, The tiniest number — it’s where counting starts!
Down
  1. 1. A cell is called a supercell if the number in it is bigger than all the numbers in the cells around it
  2. 2. A special 4-digit number that always ends at 6174 if you do a cool trick with its digits
  3. 4. Swapped places! Like switching two numbers or trading spots in a list.