Number Vocabulary

8. A number with no factors other than one and itself. (5)
9. The opposite or undoing operation. (7)
10. The smallest number which has all the numbers of interest as factors. (6,6,8)
11. Less than zero. (8)
13. A number which has all the numbers of interest as factors. (6,8)
15. Use common sense to work out roughly how big an answer should be. (8)
16. Way of writing an integer as a product of numbers which have no divisors other than themselves and one. (5,13)
17. Round numbers in a problem to get an idea of the final answer. (11)
19. Greater than zero. (8)
20. Another word for a factor. (7)
22. Take away. (8)

1. The inverse of multiply. (6)
2. A whole number of lots of something. (8)
3. The biggest divisor shared by all numbers of interest. (7,6,6)
4. Diagram showing values, used to help in calculations. (6,4)
5. Times by. (8)
6. One of addition, multiplication, subtraction and division. (9)
7. A divisor shared by all the numbers of interest. (6,6)
8. How much a particular digit within a number is worth, which depends on where it is relative to the decimal point. (5,5)
9. A whole number. (7)
12. An integer which divides into a number with no remainder. (6)
14. Remove common factors to get smaller numbers to work with, for example in a fraction (8)
17. Another word for plus. (3)
18. What is left over after you share a number with another number. (9)
19. The result when you multiply numbers together. (7)
21. Number with a point in it which is not an integer. (7)