Across
- 2. Each group of three digits in a multi-digit number; periods are usual separated by commas.
- 6. The operation that undo each other like addition and subtraction or multiplication and division.
- 7. A number that is close to an exact amount.
- 8. A way to write numbers by showing the value of each digit.
Down
- 1. A way to write numbers using words.
- 3. A way to write numbers by using the digits 0-9, with each digit having a place value.
- 4. To replace a number with another number that tells about how much or how many.
- 5. The space after the ones period in the base-ten number system.