《2025年灵机一动小学数学口算心算三年级上册苏教版》

口算练习 10
$8×3= $24
$80×3= $240
$8×30= $240
$4×1= $4
$40×1= $40
$4×10= $40
$6×3= $18
$60×3= $180
$6×30= $180
$5×5= $25
$5×50= $250
$40×9= $360
$2×60= $120
$60×9= $540
$7×5= $35
$7×50= $350
$20×8= $160
$2×80= $160
$3×90= $270
$30×9= $270
$10×8= $80
$1×80= $80
$4×80= $320
$40×8= $320
$5×90= $450
$50×9= $450
$70×2= $140
$7×20= $140
$300×4= $1200
$200×4= $800
$100×5= $500
$400×2= $800
$500×7= $3500
$700×2= $1400
$802×9\approx$7200
$897×5\approx$4500
$596×6\approx$3600
$61×6\approx$360
$88×5\approx$450
$903×5\approx$4500
$69×2\approx$140
$698×2\approx$1400

答案： 解析：本题为口算题，且题目中只含有整数，所以结果直接写整数，另外题目中有约等号的题为估算题，需要将数估成整十或整百的数进行计算。
答案：
$8×3= 24$
$80×3= 240$
$8×30= 240$
$4×1= 4$
$40×1= 40$
$4×10= 40$
$6×3= 18$
$60×3= 180$
$6×30= 180$
$5×5= 25$
$5×50= 250$
$40×9= 360$
$2×60= 120$
$60×9= 540$
$7×5= 35$
$7×50= 350$
$20×8= 160$
$2×80= 160$
$3×90= 270$
$30×9= 270$
$10×8= 80$
$1×80= 80$
$4×80= 320$
$40×8= 320$
$5×90= 450$
$50×9= 450$
$70×2= 140$
$7×20= 140$
$300×4= 1200$
$200×4= 800$
$100×5= 500$
$400×2= 800$
$500×7= 3500$
$700×2= 1400$
$802×9\approx 7200$
$897×5\approx 4500$
$596×6\approx 3600$
$61×6\approx 360$
$88×5\approx 450$
$903×5\approx 4500$
$69×2\approx 140$
$698×2\approx 1400$