1 plus 1 equals one fact
4+3=7
yes
one plus 2 is 3
3 3/4
1 plus 1 equals one fact
2 plus 1 equals 3. 2 + 1 = 3 for the simple fact that if you had 2 apples and someone gave you another one. you would have three apples.
4+3=7
yes
1.5 + 0.5 + 1 = 3 You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
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.
a multiple of 3
Nobody discovered it. In fact, it is only true for one particular value of x.
6+7
1/3 plus 1/4 plus 1/6 is = 3/4 or 0.75
one plus 2 is 3
It is 3 + l looIt is 3 + l looIt is 3 + l looIt is 3 + l loo