1. 直接写出得数。
5.83+4.99=
76+21.4=
4.2-1.9=
0.69+1.35=
4.34-4=
37×2=
2.49+15.1=
3.59+0.41=
47÷5=
7.6+0.86=
18+78.2=
9.1-1.93=
3.12-0.18=
18-5.38=
2.13+1.5=

1. 5.83+4.99=10.82
2. 76+21.4=97.4
3. 4.2-1.9=2.3
4. 0.69+1.35=2.04
5. 4.34-4=0.34
6. 37×2=74
7. 2.49+15.1=17.59
8. 3.59+0.41=4
9. 47÷5=9.4
10. 7.6+0.86=8.46
11. 18+78.2=96.2
12. 9.1-1.93=7.17
13. 3.12-0.18=2.94
14. 18-5.38=12.62
15. 2.13+1.5=3.63

2. 列竖式计算。
12.3−7.51=
4.32+2.89=
15−9.42=

1. 12.3−7.51=4.79
2. 4.32+2.89=7.21
3. 15−9.42=5.58

3. 递等式计算。(能简算的要简算)
24.23+6.58+3.77
92.56－35.37－4.63
89.6+5.36－18.75
75.14－(23.14－6.86)
13.73+21.21+5.27+0.79
4.28+6.53－3.47

1. 24.23+6.58+3.77=24.23+3.77+6.58=28+6.58=34.58
2. 92.56－35.37－4.63=92.56－(35.37+4.63)=92.56－40=52.56
3. 89.6+5.36－18.75=94.96－18.75=76.21
4. 75.14－(23.14－6.86)=75.14－23.14+6.86=52+6.86=58.86
5. 13.73+21.21+5.27+0.79=(13.73+5.27)+(21.21+0.79)=19+22=41
6. 4.28+6.53－3.47=10.81－3.47=7.34