2 tens and 13 ones add up to 33 because 10 +10 +13 = 33.
13+13+13=39
2 coins add up to 11cent = 13
They add up to 28
19
9 and 4 add up to give 13.
They add up to 13
It is: 12+1 = 13
13, 17, and 13. 13+13 = 26 + 17 = 43
The two square numbers which add up to 13 are 9 (which is equal to 3 squared), and 4 (which is equal to 2 squared).
-32
They are: 23+3 = 26