口算
2×4= 16+65= 16+69=
11+3= 4×9= 13+46=
16+66= 41-18= 11+1=
20+78= 12÷6= 11+21=
21-19= 11+25= 86-15=
11+9= 11+22= 11+78=
28÷4= 11+80= 2×8=
42÷7= 13+49= 11+27=
6×6= 11+11= 16+70=
4×7= 11+28= 21+62=
4×5= 17+71= 13+57=
5×6= 64÷8= 23+25=
17+72= 14+52= 41-30=