问题
解答题
估算
23×41≈
98×39≈
297÷4≈
428÷7≈.
答案
23×41≈20×40=800;
98×39≈100×40=4000;
297÷4≈280÷4=70;
428÷7≈420÷7=60;
故答案为:800,4000,70,60.
估算
23×41≈
98×39≈
297÷4≈
428÷7≈.
23×41≈20×40=800;
98×39≈100×40=4000;
297÷4≈280÷4=70;
428÷7≈420÷7=60;
故答案为:800,4000,70,60.