十几减几退位减法口算练习.ppt

看谁算的又对又快看谁算的又对又快退位减法退位减法1.11-3=2.17-9=3.13-6=4.11-5=5.14-8=6.12-6=7.11-7=8.12-3=9.14-7=10.11-9=11.12-4=12.11-6=13.12-5=14.11-8=15.15-6=16.12-7=17.13-4=18.12-9=19.13-5=20.14-6=21.12-8=22.13-7=23.15-9=24.13-8=25.15-8=26.13-9=27.14-5=28.16-8=29.14-9=30.15-7=31.16-7=32.11-4=33.16-9=34.17-8=35.11-2=36.18-9=37.