一、口算。
$110 - 25 =$
$650 ÷ 50 =$
$32 × 30 =$
$750 ÷ 3 =$
$4 × 55 =$
$24 × 50 =$
$29 + 63 =$
$430 ÷ 10 =$
$700 ÷ 35 =$
$300 ÷ 20 =$
$43 × 2 =$
$720 ÷ 90 =$
$220 × 6 =$
$300 ÷ 12 =$
$410 ÷ 2 =$
$82 - 28 =$
$24 × 40 =$
$20 × 75 =$
$180 ÷ 60 =$
$23 + 49 =$
$96 ÷ 12 =$
$2000 ÷ 40 =$
$18 × 30 =$
$302 × 4 =$
$29 + 99 =$
$95 ÷ 5 =$
$34 × 30 =$
$64 ÷ 4 =$
$12 × 8 =$
$205 ÷ 5 =$

110-25=85
650÷50=13
32×30=960
750÷3=250
4×55=220
24×50=1200
29+63=92
430÷10=43
700÷35=20
300÷20=15
43×2=86
720÷90=8
220×6=1320
300÷12=25
410÷2=205
82-28=54
24×40=960
20×75=1500
180÷60=3
23+49=72
96÷12=8
2000÷40=50
18×30=540
302×4=1208
29+99=128
95÷5=19
34×30=1020
64÷4=16
12×8=96
205÷5=41

二、先量一量，再算出每个图形的周长。
1.
2.

1. 量一量略
$(6+4)×2=20$(厘米)
2. 量一量略
$3+4+6+5=18$(厘米)