How to do addition, subtraction, multiplication and division in the second grade oral arithmetic problems?
38+9=28+2 1=7-7=72+ 17=8× 1= 1×9= 100-70=8×6=22+8=3×4=65+ 12=3×4= 1+4=66-66=9+ 1=60-30=8-8=3 / kloc-0/-9=33+33=6×5 = 1× 1=40-5=3×3=37-3=68-50=0+38=40+ 19=65-55=42+6=54+30=9-8=28+7=0+5=4×9=8-3=42-6=0×5=27-8=7+ 1=36- / kloc-0/2=5+7=8×8=4+8=4×7= 1 5-5=36- 12=4×8=5×9= 15+5=45+45=36+ 15=30-4=2×9= 1×3=6-6= 1+3=9×8=8 1 -9=9×7=7×8=36+63=29-7=6×8=85-4=54+9=2×2=3×9=8+8=54-9= 12-5=25+4 1=8×8= 16+6-6=48+8+ 10=80-40-40=25- 10+8=7×6+7=7×4-4=5×7+20=9×9-9=