| A．一位 | B．两位 | C．三位 |
| A．8.48－0.65＋3.48 | B．8.48－3.48－0.65 | C．8.48－3.48＋0.65 |
| A．增加0.5 | B．减少0.5 | C．增加1.9 | D．减少1.9 |
| A．8.50＋3.5 | B．8.05＋3.5 | C．8.5＋3.05 |
| A．增加4.3 | B．增加2.9 | C．减少2.9 |
A． | B．  | C． |
| A．1.1 | B．0.1 | C．0.11 |
| ⑴5+0.4= | ⑵1.4+2.7= | ⑶8.2+3.7= | ⑷5+2.4= |
| ⑸1.8+2.7= | ⑹7.3+0.9= | ⑺2+5.3= | ⑻2.0+1.8= |
| ⑼5.7+2.8= | ⑽6+2.2= | ⑾1.5+8.5= | ⑿7.4+1.6= |
| ⒀9﹣6.5= | ⒁3.2﹣2.3= | ⒂4.2﹣2.2= | ⒃3﹣2.3= |
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