2/3 is 0.66 repeated, or 66.7% (Rounded.)
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Fact family in first grade math is using 3 numbers and using the operations: Addition and Subtraction.
13 ÷ 15 = 0.866666.... or 86 2/3 % which rounds to a grade of 87.
Obviously grade 5.
usally grade 2
45%=0.45,45/100 0.3=3/10,30% 2/10=0.2,20% 0.15=3/50,15%