《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 11
$40×2=$80 $50×9=$450 $400×5=$2000 $40×9=$360 $50×2=$100 $60×6=$360 $40×5=$200 $60×7=$420 $300×5=$1500 $40×3=$120 $60×3=$180 $40×6=$240 $40×4=$160 $60×9=$540 $800×2=$1600 $40×8=$320 $60×8=$480 $90×8=$720 $40×7=$280 $60×5=$300 $901×8\approx$7200 $40×6=$240 $70×9=$630 $198×8\approx$1600 $40×1=$40 $70×8=$560 $202×7\approx$1400 $50×5=$250 $70×4=$280 $496×4\approx$2000 $50×3=$150 $80×6=$480 $503×6\approx$3000 $50×4=$200 $80×9=$720 $69×6\approx$420 $50×6=$300 $80×3=$240 $704×6\approx$4200 $50×7=$350 $90×3=$270 $61×5\approx$300

答案： 解析：本题为口算题，且题目中数字均为整十或整百的数与一个个位数相乘，直接计算即可，对于有“≈”的题目，需要估算结果，一般将不容易口算的数字估成整十或整百的数再计算。
答案：
$40×2=80$
$50×9=450$
$400×5=2000$
$40×9=360$
$50×2=100$
$60×6=360$
$40×5=200$
$60×7=420$
$300×5=1500$
$40×3=120$
$60×3=180$
$40×6=240$
$40×4=160$
$60×9=540$
$800×2=1600$
$40×8=320$
$60×8=480$
$90×8=720$
$40×7=280$
$60×5=300$
$901×8\approx7200$
$40×6=240$
$70×9=630$
$198×8\approx1600$
$40×1=40$
$70×8=560$
$202×7\approx1400$
$50×5=250$
$70×4=280$
$496×4\approx2000$
$50×3=150$
$80×6=480$
$503×6\approx3000$
$50×4=200$
$80×9=720$
$69×6\approx420$
$50×6=300$
$80×3=240$
$704×6\approx4200$
$50×7=350$
$90×3=270$
$61×5\approx300$