画□，使□得个数是◆的2倍。◆◆◆◆◆
直接写出得数 0.25×4= 0.82﹣0.56= 3.09+2.6= 6.03×100= 1﹣=﹣=+=+=
口算． 3.04﹣0.98=+= 2÷9+=×÷×= 12×（+）= 6.3÷0.01= 1﹣58%=
直接写出得数． 0.57+0.43= 4.13﹣1.3= 2.5×28= 7.2÷0.6= 0.52= 3﹣1= （+）= 15÷×=×8+8×=
快快算. 6.0﹣2.4= 5.3+3.5= 4.7+3.6= 20×13= 24×30= 640÷9====
口算下列各题． 9.9+0.01= 0.08×0.5= 1.25×0.5×0.8===﹣+=
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×8+8×
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