| __ | 1. | addend | | A. | the set of numbers {0,1,2,3,4,5,6...} |
| __ | 2. | addition | | B. | the worth based on the position of a numeral |
| __ | 3. | digit | | C. | symbols used to represent whole numbers |
| __ | 4. | horizontal | | D. | the sequence from smallest to largest |
| __ | 5. | order | | E. | combining numbers to find their sum |
| __ | 6. | place value | | F. | straight up and down |
| __ | 7. | rename | | G. | to express in a form equal to the original value |
| __ | 8. | vertical | | H. | parallel to the horizon |
| __ | 9. | whole numbers | | I. | a number added to another number |
| __ | 10. | zero | | J. | the first whole number |