一年级下册《20 以内的退位减法》练习题一
计算题(共 50 题,共 507 分)1
想一想,算一算
(1)15-9=_____,想:9 加_____等于 15,15 减 9 等于_____
(2)11-9=_____ 12-9=_____ 16-9=_____ 2+9=_____ 3+9=_____ 7+9=_____ 12-9=_____ 11-9=_____ 19-9=_____2
8+3= 15-3= 10+3= 9+3= 2+9=1+9= 11+3= 10+1= 19-11= 18-7=13-2= 18-3= 19-5= 15-5= 3+11=6+13= 18+2= 3+8= 4+13= 5+11=3
17+2= 10-1= 1+14= 11+9= 4+16=9+11= 20-2= 8+6= 10+10= 8+5=19-12= 10+4= 4+14= 1+9= 5+3=7+1= 14+2= 16-9= 15+4= 16-8=4
13+7= 18-9= 5+13= 20-12= 11+8=20-10= 7+11= 19-12= 18-7= 19-11=15-2= 15-5= 3+11= 6+9= 4+13=4+14= 11+1= 2+9= 2+7= 16-4=7+1= 1+11= 1+6= 6+11= 16-7=16-2= 11+6= 4+16= 17-10= 13+5=5
15-13+18= 12+8-17= 14-7+10= 1+7-1=19-9-4= 12-12+19= 7+6-9= 17-7+9=6
11-7=________ 12-7=________ 13-7=________14-7=________ 15-7=________ 16-7=________ 7
18-11= 15+5= 20-11= 18-9= 17-