(100-2)×43=100×43-2×43=4300-86=4214
(100+2)×67=100×67+2×67=6700+134=6834
这种简便方法一般是采取化零为整的方式,也就是说根据算式的特点,将它转变成整十整百的来计算就会方便很多,你核算一下,祝学习开心 :)
98x43
=(100-2)x43
=100x43-2x43
=4300-86
=4214
102x67
=(100+2)x67
=100x67+2x67
=6700+134
=6834
98 x 43=43 x (100-2) =4300 - 86 = 4214
102 x 67=67 x (100+2)=100 x 67 + 67x 2=6700+134=6834