7+6
Doubles are the facts in which both addends are the same. For example 3+3=6. The doubles plus one are the facts in which one addend is larger than the other by one. Examples 3+4=7, 6+7=13, 5+6=11, 3+2=5. Learning your doubles plus one should involve knowing the doubles and mentally adding the additional one.
13+13+13+13+13+13+13+13+13+13 = 13 * 10 = 130.
91
13
31
Twelve plus one is 13. 12+1=13 twelve plus one = eleven plus two (Check it out--these two mathematical phrases are anagrams of one another.) it's easy 12 + 1 = 13 because you have to add 1 to 12 and that's how ya get 13!
13
13/30
yes! 11+2=13 12+1=13
13 plus 13 is equal to 26
13 __ 15