小刚比小明大2岁，小明比小强小4岁，那么小刚和小强谁大？大多少？答：小刚比小强 ， 岁．
口算．﹣=+= 2﹣=+=﹣=﹣=++= 1﹣﹣=﹣+= 5﹣﹣=
直接写得数. 7.2÷9=﹣=+=﹣+= 5﹣=﹣×0=
= ．
直接写得数．========
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﹣
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= 2﹣
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=
﹣
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﹣
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+
= 1﹣
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+
=
﹣
+
= 5﹣
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﹣
= ．
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﹣
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