Correct: 21+6=27, 42+3=45, 52+5=57, 20+5=25, 30+2=32, 50+9=59, 60+10=70, 70+20=90, 40+20=60, 30+10=40,   61+21=82,   43+45=48, 24+35=59, 13+56=69, 20+71=91, 84+5=89, 45+10=55, 50+7=57, 3+14=17, 12+15=27, 44+33=77, Incorrect: 10+1=13, 22+5=28, 31+45=66, 10+50=70, 30+50=70, 21+32=43, 40+50=100, 41+16=39, 30+14=45, 2+71=91, 42+10=55, 40+10=60, 71+21=82, 23+65=78, 15+13=18, 31+11=45, 20+17=67,

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