Read and understand each question or statement. Choose the letter of your best answer.
1.what multiple of 7 is less than 25 but greater than 20
A.20 B.21. C.24. D.25
2.what is the second largest factor of 36?
A.15. B.16. C.17. D.18
3.What are the factors of 18?
A.1,2,3,6,9,18. C.3,4,6,10,12
B.2,3,4,5,12. D.2,5,12
4.what are the factors of 81?
A.1,3,9,27,81. C.1,2,3,9,15,27,81
B.2,15,30,41. D.1,2,3,9,27,81
5.What number is a multiple of 12?
A.12. B.21. C.34. D.36
6.what is the sum of the 1st and 4th multiple of 20
A.80. B.90. C.100. D. 120
7.What is the sum of the 2nd and 5th multiple of 10?
A.20. B.40. C.60. D.70
8.prime number are number with only 2 factors,1 and itself,like 5.It has 2 factor only 1 and 5.which of these number are prime?
A.7. B.9. C.12. D.15
9.composite number are number with 3 or more factor. 6 is a composite number.you have 2×3 and 1×6.among these given numbers, which is a composite number?
A.3. B.5. C.8. D.11
10 What are the factor of 12?
A.1,2,3,4,6,12
B.3,4,6,12
C.1,6,12
D.3,4,8,10