简便方法计算是一边写式子，一边口算，根本不用列式子。
24.24+39.9
=24.24+（40-0.1）
=24.24+40-0.1
=64.24-0.1
=64.14
24.24＋39.9
=24+0.24+39+0.9
=24+39+0.24+0.9
=63+1.14
=64.14
原式=24.24 + (40 - 0.1)
=24.24 + 40 - 0.1
=64.24 - 0.1
=64.14
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