Math Vocabulary

6. a number written as the sum of the values of its digits
8. wo operations that undo each other
10. when you arrange numbers from least to greatest or from greatest to least
13. the results of two numbers being multiplied together
15. set of steps used to solve a mathematical computation
17. a number written in words
19. To combine; put together two or more quantities
21. a close guess of the actual value, usually with some thought or calculation involved
22. the result when one number is subtracted from another

1. the way to write numbers showing only its digits
2. a group of three digits in a number separated by a comma
3. Any number being added
4. the value given to a place digit has in a number
5. having the same number of units in each group
7. take away; remove; compare
9. a number sentence with an = sign; the amount on one side of the equal sign has the same value as the amount on the other side
11. a line with numbers placed in the correct position
12. the answer to an addition problem
14. a method of approximating a number to its nearest place value
16. numbers that are easy to add, subtract, multiply, or divide mentally
18. any of the symbols 0,1,2,3,4,5,6,7,8, or 9
20. to decide if one number is greater than, less than, or equal to another number.