4×23= 50×70= 120÷29≈ 14×6= 250×4=
724÷90≈ 72÷3= 510÷3= 14 1÷7≈ 900÷30=
400÷80= 240÷60= 130×5= 150×6= 4200÷70=
7×11= 16×3-35= 15×6+28= 260萬+140萬= 184萬-84萬=
分析:根據(jù)整數(shù)乘法和除法的運(yùn)算法則進(jìn)行求解;除法估算時要注意不要有余數(shù).
解答:解:
4×23=92, 50×70=3500, 120÷29≈4, 14×6=84, 250×4=1000,
724÷90≈8, 72÷3=24, 510÷3=170, 141÷7≈20, 900÷30=30,
400÷80=5, 240÷60=4, 130×5=650, 150×6=900, 4200÷70=60,
7×11=77, 16×3-35=13, 15×6+28=118, 260萬+140萬=400萬, 184萬-84萬=100萬.
點評:完成本題要根據(jù)運(yùn)算法則認(rèn)真分析式中數(shù)據(jù),然后快速準(zhǔn)確得出答案.
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