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一、口算。
$56 + 24 = $
$200 ÷ 40 = $
$1000 - 220 = $
$37 × 40 = $
$27 × 4 = $
$18 × 50 = $
$13 × 400 = $
$144 ÷ 16 = $
$76 + 44 = $
$700 - 62 = $
$630 ÷ 2 = $
$17 + 35 = $
$200 - 109 = $
$380 × 6 = $
$328 - 238 = $
$840 ÷ 2 = $
$820 ÷ 4 = $
$30 × 132 = $
$40 × 55 = $
$230 - 82 = $
$160 ÷ 5 = $
$8 × 50 = $
$250 × 2 = $
$90 - 15 = $
$1320 ÷ 10 = $
$199 + 11 = $
$42 × 30 = $
$122 - 78 = $
$17 × 50 = $
$270 ÷ 90 = $
$56 + 24 = $
80
$200 ÷ 40 = $
5
$1000 - 220 = $
780
$37 × 40 = $
1480
$27 × 4 = $
108
$18 × 50 = $
900
$13 × 400 = $
5200
$144 ÷ 16 = $
9
$76 + 44 = $
120
$700 - 62 = $
638
$630 ÷ 2 = $
315
$17 + 35 = $
52
$200 - 109 = $
91
$380 × 6 = $
2280
$328 - 238 = $
90
$840 ÷ 2 = $
420
$820 ÷ 4 = $
205
$30 × 132 = $
3960
$40 × 55 = $
2200
$230 - 82 = $
148
$160 ÷ 5 = $
32
$8 × 50 = $
400
$250 × 2 = $
500
$90 - 15 = $
75
$1320 ÷ 10 = $
132
$199 + 11 = $
210
$42 × 30 = $
1260
$122 - 78 = $
44
$17 × 50 = $
850
$270 ÷ 90 = $
3
答案
80 5 780 1480 108 900 5200 9 120 638 315 52 91 2280 90 420 205 3960 2200 148 32 400 500 75 132 210 1260 44 850 3
二、计算下面图形的底或高。
$S_{平行四边形}= 84m^{2}$
$S_{三角形}= 28cm^{2}$
$S_{平行四边形}= 84m^{2}$
$S_{三角形}= 28cm^{2}$
答案
84÷7=12(m) 28×2÷14=4(cm)
