13.口算
0 158945 158953 158959 158963 158969 158971 158975 158981 158983 158989 158995 158999 159001 159005 159011 159013 159019 159023 159025 159029 159031 159035 159037 159039 159040 159041 159043 159044 159045 159047 159049 159053 159055 159059 159061 159065 159071 159073 159079 159083 159085 159089 159095 159101 159103 159109 159113 159115 159121 159125 159131 159139 199269
13×3= | 3×500= | 70×3= | 720÷8= |
36÷2= | 108×4= | 150×4= | 510÷5= |
640÷4= | 186÷6= | 250×4= | 2400÷8= |