直接写得数．9.3×7.9≈ ×0.5=1 ×= +=÷2= ×5÷×5= 0.42= 0.561×100=
直接写出得数．÷=+=÷=×= 1÷0.25=÷1=÷3=﹣=
直接写出得数．÷=×3= 6×=+×7= 100÷10%=÷1=÷7=
=÷21= 2.4×= 42÷=×= 10×10%= 3﹣1= 3π= 1﹣+=×÷×=
÷8= 1÷0.01=×6=÷= 1÷=+=﹣=÷=+=×=
直接写得数．========
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÷2= 
÷
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÷1=
÷3=
﹣
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×3= 6×
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×7=
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÷21= 2.4×
= 42÷
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= 3π= 1﹣
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÷8= 1÷0.01=
×6=
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= 1÷
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﹣
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