Correct: 4+3=7 , 10+1=11, 5+5=10, 15+3=18, 20-5=15, 10-4=6, 15-2=13, 19-1=18, Incorrect: 2+2=5, 5+6=12, 1+1=3, 10-3=9, 20-5=20, 17-1=20, 20-5=14, 15-3=11,

Addition and Subtraction Facts Within 20

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