口算．
| ⑴0.9+0.4= |
⑵9﹣0.7= |
⑶0.36+0.54= |
⑷1﹣0.26= |
| ⑸3.6+0.4= |
⑹1.29﹣0.29= |
⑺0.74+0.26= |
⑻0.57﹣0.5= |
| ⑼2.8+1.12= |
⑽6.2+1.8= |
⑾2.8﹣2.3= |
⑿1.3﹣0.6= |
算一算．
| ⑴ |
⑵ |
⑶ |
⑷ |
 ﹣ = |
 ﹣ = |
  = |
 + = |
| ⑸ |
⑹ |
⑺ |
⑻ |
1﹣ = |
 ﹣= |
 + = |
 += |
| ⑴42×23+15 |
⑵28×35﹣80 |
| ⑶780﹣38×12 |
⑷（55+43）×14 |
| ⑸（87+67）÷2 |
⑹54÷3×16 |
看下列算式是否正确。如果不正确请改正．
⑴43×14=
⑵38×45=
算一算．
| ⑴ 13×21 |
⑵ 23×32 |
⑶ 48×16 |
⑷ 56×33 |
| ⑸ 78×43 |
⑹ 69×54 |
⑺ 43×52 |
⑻ 16×21 |
| ⑼ 23×50 |
