Question 1 :
Write 5 as the sum of two consecutive primes.
Question 2 :
Write 7 as the sum of any two different primes.
Question 3 :
Write 8 as the sum of two consecutive primes.
Question 4 :
Write 10 as the sum of any two different odd primes.
Question 5 :
Write 10 as the sum of three consecutive primes.
Question 6 :
Write 12 as the sum of two consecutive primes.
Question 7 :
Write 17 as the sum of any four diffferent primes.
Question 8 :
Write 18 as the sum of any three different primes.
Question 9 :
Write 20 as the sum of any two diffferent primes.
Question 10 :
Write 20 as the sum of any two diffferent primes.
Question 11 :
Write 20 as the sum of any three diffferent primes.
Question 12 :
Write 21 as the sum of any four diffferent primes.
Question 13 :
Write 22 as the sum of any three diffferent primes.
Question 14 :
Write 23 as the sum of any four diffferent primes.
Question 15 :
Write 24 as the sum of any three diffferent primes.
Question 16 :
Write 25 as the sum of any two diffferent primes.
Question 17 :
Write 26 as the sum of any two diffferent primes.
Question 18 :
Write 26 as the sum of any four diffferent primes.
Question 19 :
Write 27 as the sum of any four diffferent primes.
Question 20 :
Write 27 as the sum of any three diffferent primes.
Question 21 :
Write 28 as the sum of any three diffferent primes.
Question 22 :
Write 29 as the sum of any four diffferent primes.
In the table shown below, the crossed-out numbers are composite and the coloured numbers (encircled) are primes.
Using the table above, answers the following questions.
Question 23 :
Write 42 as the sum of two consecutive primes.
Question 24 :
Write 52 as the sum of two consecutive primes.
Question 25 :
Write 60 as the sum of two consecutive primes.
Question 26 :
Write 68 as the sum of two consecutive primes.
Question 27 :
Write 78 as the sum of two consecutive primes.
Question 28 :
Write 78 as the sum of two consecutive primes.
Question 29 :
Write 90 as the sum of two consecutive primes.
Question 30 :
Write 100 as the sum of two consecutive primes.
Question 31 :
Write 128 as the sum of two consecutive primes.
Question 32 :
Write 31 as the sum of any three odd primes.
Question 33 :
Write 55 as the sum of any three odd primes.
Question 34 :
Write 79 as the sum of any three odd primes.
Question 35 :
Write 104 as the sum of any three primes.
1. Answer :
5 = 2 + 3
2. Answer :
7 = 2 + 5
3. Answer :
8 = 3 + 5
4. Answer :
10 = 3 + 7
5. Answer :
10 = 2 + 3 + 5
6. Answer :
12 = 5 + 7
7. Answer :
17 = 2 + 3 + 5 + 7
8. Answer :
18 = 2 + 3 + 13
9. Answer :
20 = 7 + 13
10. Answer :
20 = 7 + 13
11. Answer :
20 = 2 + 7 + 11
12. Answer :
21 = 2 + 3 + 5 + 11
13. Answer :
22 = 2 + 3 + 17
14. Answer :
23 = 2 + 3 + 5 + 13
15. Answer :
24 = 2 + 3 + 19
16. Answer :
25 = 2 + 23
17. Answer :
26 = 3 + 23
18. Answer :
26 = 3 + 5 + 7 + 11
19. Answer :
27 = 2 + 3 + 5 + 17
20. Answer :
27 = 3 + 5 + 19
21. Answer :
28 = 2 + 3 + 23
22. Answer :
29 = 2 + 3 + 5 + 19
23. Answer :
42 = 19 + 23
24. Answer :
52 = 23 + 29
25. Answer :
60 = 29 + 31
26. Answer :
68 = 31 + 37
27. Answer :
78 = 37 + 41
28. Answer :
84 = 41 + 43
29. Answer :
90 = 43 + 47
30. Answer :
100 = 47 + 53
31. Answer :
128 = 61 + 67
32. Answer :
31 = 5 + 7 + 19
33. Answer :
55 = 3 + 23 + 29
34. Answer :
79 = 19 + 29 + 31
35. Answer :
104 = 2 + 19 + 83
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