先用尺量一量，再算出它们的周长分别是多少
①②③④⑤⑥⑦⑧（1）商大于被除数的有 它们的除数都 ．（2）商等于被除数的有 它们的除数都 ．（3）商小于被除数的有 它们的除数都 ．
计算 21÷ 121÷．
直接写得数×0.25= ÷= 2×÷= 6.3×=÷= 2﹣﹣= 2.6×11﹣2.6= 1.8×4×0.5=
口算我最棒!= = = == = = ==
口算×= ×= 12×= +3=÷= ÷4= ×= 5÷=
②
③
④
⑤
⑥
⑦
⑧
121÷
．
×0.25= 
÷
= 2×
÷
=
÷
= 2﹣
﹣
= 2.6×11﹣2.6= 1.8×4×0.5=
= 
= 
= 
=
= 
= 
= 
=
=
×
×
= 12×
= 
+3=
÷
= 
÷4= 
×
= 5÷
=
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