| 243+57= | 219-38= | 10.7-8.47= | 8.35+11.65= |
| 0.125×800= | 200÷40= | 80×20%= | 1.5÷0.5= |
3- = | + = | × = | 6÷ = |
| 23+2= | (1- )×16= | 0.25×4÷0.25×4= | ×8+8× = |
| 243+57=300, | 219-38=181, | 10.7-8.47=2.23, | 8.35+11.65=20, |
| 0.125×800=100, | 200÷40=5, | 80×20%=16, | 1.5÷0.5=3, |
3- =2 , | + = , | × = , | 6÷ =7, |
| 23+2=10, | (1- )×16=10, | 0.25×4÷0.25×4=16, | ×8+8× =8. |
分析:根据整数、小数、分数和百分数的加减乘除的计算方法进行计算即可;0.25×4÷0.25×4按照从左向右的顺序进行计算;
×8+8×
根据乘法分配律进行简算.点评:口算时,注意运算符号和数据,然后再进一步计算,能简算的要简算.
=
+
=
=
=
)×16=
,
,
,