20以内加减法练习题试题库.docx

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1、6+10 =6+10 =13-3 =8+2 =7+9 =9 + 1+4=16-6=10+9 =14-1 =8+3 =7+5 =7+3+5=16-10 =8 + 10 =10+2 =2+9 =8 + 6 =7+4+6=10 + 3 =13-3 =13-3=19-9 =8 + 8 =7+8+3=3 + 10 =5 + 10 =3 + 15 =9+3 =7+4=6+4+7=13-3 =16-10 =18-8 =8+4=8+5 =8+24-5 =13-10 =11-10=5+5 =5+9 =7+7=5+4+6=10+5 =13-10 =4+6=8+6=6+5 =7+2+3=5 + 10 =18-10

2、=20-20 =4+9 =1+9 二3+44-10 =10 + 8 =10-10 =12+4=5+9 =7+3 =11-1-5 =3+10=10+9 =8-8 =6+9 =6+7 =17-7-3 =11-1 =10-5 =10+0=7+9 =5+6=19-9 + 1 =8+4=9+7=9+7=94-0 =10-7 =13-3-4=8+5 =6+6=6+5 =5+8 =6+7=18-10-4=9 + 6=4+9 =2+8 =8+9 =2+9 =17-10-7 =6+8 =6+5 =7+7 =9+9 =9+4=14-10+5 =7+9 =5+8 =8+8 =9+3 =5+9 =16-10 + 3

3、=8 + 10 =5+7=4+8 =3+8 =9+5 =20-10-7 =7+4=8+7=8+6=7+5 =0 +11 =6+2+7=5+7=4+8=7+6 =6+9 =19-16 =4+5+2=9+2 =8 + 6=3+9 =9+5 =0 +11 =3+5+7=7+8 =7+10=5+9=7+7=0 + 3 =4+4+6=9+8=2+8 =3+8=9+4=3 +12 =4+3+2=9 + 2 =10-9 =6+4=7+8 =19- 6 =4+6+5 =8 + 3 =2 + 10 =7+2 =9+6=5 +12 =7+2+4=6+7 =9+8 =6+9 =8+3 =9 4- 0 =2+6+5=

4、8+4=6 + 3 =6+8=7+4=12+ 0 =7+1+7=2 +16 =7 - 3 =14- 1 =19+ 0 =10-0 =9-2 =5 - 3 =16- 3 =12+ 1 =2 4-6 =5+5 =5 + 1 =18-11 =10+ 7 =15-12 =11+ 3 =2+5 =2 + 6=1 +16 =5 - 5 =3 + 3 =4 + 3 =18-12 =7 - 7 =4 一 1 =5 - 3 =9 6 =0 + 6=0 + 1 =7 - 0 =1 +10 =2 + 1 =10-0 =9-2 =2 + 3 =19- 9 =17- 4 =7 + 2 =5+5 =5 + 1 =4 4

5、=16+ 1 =6 - 2 =14-12 =2+5 =2 + 6 =16+ 3 =5 - 5 =18+ 0 =18-16 =7+0 =5+4=5 4-12 =13- 2 =2 4- 6 =8 - 5 =10-4=54=16+ 3 =1 +13 =4 - 0 =16-13 =54=7+3 =18-10 =17- 5 =8 - 3 =3 +14 =4-4 =10-9 =9 + 0 =16- 6 =16- 0 =13- 2 =2+6=9-7 =13+ 3 =4 0 =3 + 2 =3 +14 =3+5 =7+1 =17- 4 =0 +16 =0 + 6 =15+ 1 =8-2 =0 + 8 =10+

6、 4 =8 - 2 =3 +11 =8 - 8 =10-2 =7-2 =114- 3 =19- 5 =2 +11 =1 + 0 =5+5 =5 + 2 =104-10 =16-14 =9 - 4 =15-10 =4+6=2 + 7 =5 4 =7 - 5 =5 + 4 =4 +10 =10-4=1+2 =17- 3 =17- 4 =14- 2 =15-14 =3+2 =3+4 =15+ 3 =1 + 4 =19-17 =17- 4 =9-3=8-3=17-16 =15 4 =15-12 =8 +10 =3 + 1 =6+1 =3 + 3 =5 + 1 =19- 5 =0 +19 =64 =9-

7、2 =2 + 6 =18- 8 =2 +16 =84 =9-4 =8 + 1 =15+ 1 =7 - 3 =5 2 =7 +11 =95 =3 + 3 =14+ 3 =14+ 1 =13- 2 =4 + 3 =5-3 =0 + 8 =12+ 3 =10+ 6 =3 +15 =12-12 =2-1 =12+ 0 =1 +16 =14+ 2 =1 +14 =15- 2 =4-2 =13- 0 =7 - 5 =71 =10- 0 =10+ 1 =10-7 =19- 3 =5 +10 =2 + 5 =11+ 6 =8 - 2 =144- 2 =8 6 =11+ 7 =9 - 6 =10+ 6 =16+

8、 3 =4 +15 =19-18 =7 - 1 =17+ 0 =19- 2 =19- 5 =1 + 1 =11+ 1 =8 - 2 =11+ 0 =5 + 2 =17-12 =17- 3 =3 + 0 =2 4-4 =2 4-3 =12+ 3 =5 - 1 =1 +10 =3 + 1 =1 +16 =16- 3 =18-10 =2 +10 =8 - 7 =3 +10 =15- 4 =15+ 2 =16-14 =14-1 =19- 9 =19- 6 =15-10 =15- 2 =3 - 3 =3 +10 =17- 3 =3 + 2 =15- 2 =2 4-10 =5 +14 =18- 1 =12

9、-11 =16- 5 =15- 4 =7 - 3 =2 +10 =5 +10 =10+ 9 =6 - 2 =11-10 =17- 2 =18- 5 =9 - 2 =4 +15 =12- 1 =19-19 =17-14 =2 + 2 =13+ 6 =7 - 6 =17-16 =14-9 =10+4 =5 + 10 =9+9 二1 +156+3+4=10-5 =6+8=13-3 =8+4=18- 76+1+5=9+5=9+3 =3+8 =7+6=16 5=5+2+4=8 + 2 =7+4=6+7 =9+4=5 13+5+9=5 + 2 =8 + 3 =54=6+8 =15- 36+4+1 8+9

10、=9+8 =7+6=7+9 =18- 83+6+5=10 + 8 =8+5 =9+6=9+8 =9 - 17+2+6=5+5=9+5 =7+8 =9 + 3 =19- 64+4+9=4+6=5+9 =6+7 =8+4=12+ 19+1+9=9+4=8+4=9 + 7=8 + 3 =3 4-10=8+2+2=7+4=6+5 =8+6=6+6=14+ 1=7+3+1=8+4=6+6=6+8 =16-8=5 +108+2+4=10-2 =7+7=8+5 =3+9=12+ 17+3+2=2+9 =9+7 =5+8 =15-4=6 18+2+6=7+5=8+8 =8+4=11-2=19-147+3+4=

11、18-2 =9+2 =4+8=4+8 二1 +119+1+8=10+5 =5+7=9-4=12+3=5 4-14=8+2+5=9+6=9+5 =7+6=16-8=0 + 05+4+9=8+4=7+9 =6+7=6+7=1 +17=5+2+2=9+4=8 + 10 =7+5 =14-9=1 +153+6+4=8 + 7=6+10 =5+7 =19-9=16 05+2+7=9 + 2 =8+6=4+7 =7+5=2 +137-3+6=7+5 =19-7 =7+4=16-8=12+ 77-2+7=74-9 =7+3 =9+3=18-9=3 4-124+2-3=8+5 =2+8 =6+6 =6+7=1

12、8-116+3+4=9+2=3+8=11-5=7+6 二2 + 44+2+5=12-4=6+5=13-5=8+5 二19-117+2+7=4+7=9+9=18-9=13-4 二1 + 7 =8 + 1+2 =17-7=5+7=7+7=6+6=10+ 41+8+5=11-3=15-7=12-6=7+7=15- 46+3+9=6+8=14-8=9+6=16-2=6 410-1+2 =11-4=5+8=2+9=11-6=19-10=82+6=15-8=6+10=15-3=11-9=8-44+42=9+8=3+9=15-6=12-8=17-14=6+2+7=8+7=16-7=5+6 二10+6 二14

13、-126+3+7=16-8=6+6 二15-9=17-8=16-115+4+7=6+5=12-4=6+7=12-9=15+ 2=4+5+8=15-6=12-6=14-5=7+4=19- 21+0+7=9+3=12-5=4+9 二14-7=17+ 2961 =3+8=17-7=12-10=8+8 二9-25+4+6=10+6=16-7=9+6=6+7=2 4-105+1+7=8+7 二4+13=11-1 =6+6 二0 + 72+3+9=11-2=12-7=17-9=16-8=18-137+2+6=5+6=9+8 二15-9=7+4=0 + 2=9+1+5=6+8=13+6 二8+4=11-7=

14、9-97+3+2=8+8=7+9=10+2=14-7=0 + 010 + 8-4=6+5 二4+7 二13-8 二16-9=1 +107-2+9=13-7=14-9=9+5=9+6=8-76+2+7=15-7=8+9=15-9=12-3=0 +11 =8+2+7=7+8 二8+3 二7+5 二12+3=1 + 4 =6-3+9=9+4=13-9=7+6 二17- 5 =16+ 1 =3+6+9=9+6=8+5=16-8=16- 1 =10+ 9 =2+6+5=8+6=10+5=9+9=6 +10 =12-10 =7+2-5=18-8=14-9=18-9=10+ 2 =11+ 3 =9-2+7=

15、3+9=11-7=14-2=4 + 1 =17- 1 =8-2+8=11-3=5+6 二15-8=4 +12 =14-10 =9-4+7=11-2=16-9=4+8=14+ 1 =2 + 2 =8-2+7=15-7=13-7=12-8=7 - 2 =2 +11 =9-4+7=16-7=15-8=13-9=104- 4 =18- 6 =6+2+9=8+5 二10+3=9+3 二13- 2 =12- 1 =8-24-3 =7+8 二13-8=9+5 二15+ 4 =13-11 =9-4+6=9+4=5+8=17-8=19-14 =1 +18 =4+3+5=8+6=14-8=17-7=16 4 =7

16、 - 6 =6+2-3=15-8=13-4=18-4=4 +12 =7 - 1 =3+9+6=18- 5 =17-11 =13+ 6 =17-15 =19-18 =10-5+4=16-10 =5 4 =9 - 4 =16+ 1 =18- 3 =3+4+6=7 +10 =9 - 0 =18+ 1 =11+ 5 =0 + 6 =96+4=4 - 0 =18-12 =17-17 =12+ 4 =18- 1 =4+5+8=10-10 =9 - 0 =15- 0 =17-10 =13-10 =7+5-7=0 +16 =2 + 2 =13-12 =13+ 2 =10-10 =10-4-0 =13+ 4 =

17、6 - 5 =15-13 =1 +14 =17- 3 =4+5+8=3 +12 =0 4-0 =0 +17 =11+ 1 =2 +13 =2+3+4=2 +14 =11-10 =11+ 4 =2 +11 =7 - 4 =6+3+8=14- 3 =11- 1 =3 - 1 =3 + 1 =5 + 1 =3+3+2=12- 0 =11+ 0 =13-10 =5 + 4 =19- 5 =2+2+4=3 + 5 =10+ 7 =0 + 1 =7 4-11 =6 +11 =4+8+7=11+ 1 =17- 1 =16+ 2 =10+ 3 =6 5 =10 + 2 + 7 =3 + 4 =1 +14 =1

18、4+ 2 =1 + 7 =7 + 2 =12 + 6-5 =12+ 5 =14+ 1 =10+ 8 =11+ 0 =17-15 =7-74-5 =15- 3 =9 - 8 =11+ 5 =2 + 6 =3 + 5 =8+2+7=12+ 3 =17-12 =1 +17 =12-10 =3 + 1 =8-3+7=2 + 6 =19- 5 =7 - 3 =19-11 =7 + 1 =5+2+3=10+ 7 =1 +12 =11+ 1 =10+ 3 =17- 2 =6+2+2=9 - 9 =4 +12 =11+ 2 =19- 8 =4 + 3 =3+3+1=16- 1 =19-13 =4 - 3 =1

19、7+ 0 =2 +16 =2+3+5=15- 3 =6 5 =13+ 1 =2 - 2 =2 +14 =3-0+7=19- 1 =2 + 6 =19-18 =11- 1 =17-10 =5-54-5 =2 4- 6 =18-13 =12+ 7 =10+ 9 =1 + 7 =7-3+4=3 + 4 =16-14 =18- 2 =8 +10 =7 + 1 =6+2-6=2 - 2 =7 - 3 =6 0 =9 5 =7 - 6 =87+6=13- 3 =8 - 6 =0 +18 =8 - 2 =10+ 9 =5+1+7=18-11 =17+ 0 =2 - 2 =19- 3 =14+ 4 =0 +

20、3 =6 - 3 =13+ 1 =5 +14 =5 - 2 =18- 5 =14+ 4 =7 - 1 =0 +10 =6 1 =3 +11 =7 +10 =7 + 0 =11-10 =11+ 3 =5 4-10 =14+ 4 =5 +12 =18- 3 =0 +11 =5 +10 =5 5 =7 + 2 =2 4- 4 =7 - 1 =17-13 =2 + 2 =3 +11 =4 + 5 =9- 8 =10+ 1 =17- 3 =10 =9 - 5 =9 - 8 =12+ 3 =1 +14 =8 + 0 =17- 1 =13-10 =3 - 0 =1 + 1 =9 - 5 =5 - 3 =9

21、- 8 =7 - 3 =14-12 =6 +11 =0 +17 =1 4- 3 =5 +11 =10+ 5 =19- 5 =13- 2 =6 +12 =5 - 2 =7 - 6 =12+ 6 =19-10 =12+ 7 =2 +10 =14+ 5 =1 4- 3 =2 +10 =14 4 =13-10 =16-13 =10+ 8 =2 - 1 =9 - 1 =12+ 1 =5 +13 =2 +10 =14-8 =12+ 6 =9 - 3 =6 0 =19- 1 =4 - 4 =17-11 =11-10 =7 - 6 =9 - 1 =2 +13 =2 +15 =15-11 =7 - 4 =161

22、4 =8 - 0 =4 +13 =9 - 0 =8 6 =15- 2 =16-13 =3 - 3 =10+ 2 =6 +13 =8 - 7 =2 +17 =5 +14 =13- 2 =1 +18 =18-11 =11+ 3 =5 +12 =16-12 =18-15 =12+ 4 =0 +16 =17- 4 =7 +11 =18- 7 =2 - 1 =2 4-1 =6 6 =14- 2 =5 3 =0 + 4 =3 + 6 =4 +13 =5 + 1 =17-14 =16-14 =3 +12 =19- 7 =13+ 2 =16-14 =19-15 =18- 2 =11+ 2 =13+ 0 =6

23、- 2 =4 +12 =19- 5 =10+ 1 =2 +15 =0 + 1 =4 - 1 =16-14 =12-11 =3 + 3 =18- 4 =3 +13 =12-11 =4 - 1 =1616 =1 + 8 =1 +13 =3 +12 =17-11 =18-12 =18-11 =18- 7 =0 +19 =17-11 =0 +12 =3 +11 =15-11 =12+ 3 =18-13 =2 + 3 =2 + 6 =5 +12 =1 + 7 =18-16 =18- 6 =3 + 6 =19- 3 =7 - 4 =6 - 3 =13- 1 =19-15 =4 + 5 =18-12 =2

24、+17 =6 6 =0 +19 =9 一 2 =7 + 1 =7 - 5 =7 +11 =12+ 3 =2 4-11 =7 - 3 =1 + 7 =17-14 =1 +15 =8 - 0 =1 + 5 =15+ 3 =12+ 2 =6 + 1 =0 +17 =2 + 4 =19-17 =3 + 6 =18- 6 =6 1 =16- 5 =17-10 =1 +15 =7 - 6 =16-14 =15-14 =7 + 0 =2 +14 =5 +13 =15+ 1 =19-19 =5 +11 =6 + 0 =17- 2 =2 + 3 =14+ 0 =12-12 =5 + 2 =16-14 =0 +

25、1 =18-12 =18- 8 =3 - 0 =12+ 3 =3 + 1 =12-11 =4 +11 =12+ 7 =4 - 0 =0 +18 =12+ 5 =14+ 5 =19- 1 =14+ 1 =19-18 =19-13 =18+ 0 =12+ 4 =17-11 =5 + 3 =9 - 1 =6 5 =15- 4 =6 +10 =17-16 =18- 1 =17- 6 =3 + 6 =12+ 1 =6 +12 =12-10 =5 +10 =19- 1 =14-8 =4 + 4 =17-14 =11+ 1 =19-17 =12-11 =8 - 2 =3 +10 =5 - 3 =19-19

26、=4 + 3 =1 +13 =3 +13 =6 3 =43 =3 + 1 =42 =18- 2 =7 - 5 =19-19 =13- 1 =15- 3 =7 - 1 =2 +14 =16+ 3 =13-13 =1 +10 =7 +10 =15-10 =8 +10 =10+ 0 =6 - 2 =1 + 7 =3 - 2 =18- 3 =2 + 4 =6 +12 =15+ 3 =1 4-18 =13- 0 =15- 0 =1 +14 =16-14 =12+ 4 =17+ 0 =16 4 =2 - 2 =2 + 6 =2+4 =65 =19- 4 =11+ 2 =3 +15 =1 + 1 =8-4

27、=6+0 =0 + 9 =4 +10 =0 +11 =12+ 4 =1+1 =8 + 1 =4 - 3 =0 + 5 =9 - 0 =6 - 1 =4+4 =5-1 =17+ 2 =16+ 1 =12-10 =1 +14 =3-3 =1+5 =1 + 7 =10+ 8 =5 + 2 =18-13 =4-1 =9-3 =18- 8 =3 - 0 =0 - 0 =3 +15 =1+9 =0+9 =11-10 =12-10 =7 - 3 =5 +12 =10-5 =10-4=15-12 =15-11 =6 +10 =114- 2 =3+6=3+5 =4 4-3 =3 +14 =2 +13 =1 +1

28、6 =0 + 6 =10-7 =84 =6 2 =9 - 1 =17-16 =4+5 =7+3 =10+ 2 =7 - 4 =15-11 =19-17 =9-2 =0+5 =13- 3 =1 +12 =4 +15 =1 +11 =10-3 =9-2 =15- 1 =16- 2 =10+ 3 =12- 1 =5+2 =5 + 3 =16+ 2 =10+ 7 =2 4-5 =1 +15 =4+5 =2+6=1 4- 2 =14+ 3 =11+ 8 =15-11 =10-5=2+2 二17-16 =1 + 2 =5 +14 =13+ 5 =3+4 =95 =18-17 =12+ 3 =17-15 =

29、1 +13 =8-5 =6+3 =6 5 =6 + 2 =16+ 3 =2 +10 =1+3 =8 + 2 =16+ 1 =4 +15 =2 + 3 =12- 2 =3 + 3 =3+5 =7 - 1 =15- 1 =17- 6 =18- 6 =9-2 =86=14-2 =12+ 3 =16- 1 =17- 5 =3+0 =6+2 =15-11 =19-18 =11+ 6 =16-13 =66=9-0 =19+ 0 =1 +18 =7 - 1 =5 + 1 =9-1 =8 + 2 =4 + 2 =16-15 =1 - 1 =9 - 9 =9-0 =3+4 =7 + 1 =5 - 2 =2 +

30、4 =3 +14 =54=0+9 二10 + 10 =6 - 1 =1 + 0 =15+ 4 =4+3 =7-1 =2 +10 =0 + 4 =18-15 =5 + 3 =63 =2+5 =15-13 =5 +14 =3 + 0 =19- 8 =4-2 =10-3 =6 0 =8 - 0 =12+ 7 =19- 5 =5+3 =10-3 =13+ 4 =0 + 0 =19- 8 =13- 3 =8-4=8-5=18- 6 =18- 4 =1 +16 =19- 8 =7+0 =3+4=9 - 0 =8 - 0 =9 - 2 =9 6 =10-5 =9-2 =14- 2 =18- 6 =19-14

31、 =4 +12 =5-1 =5 + 2 =0 +17 =10+ 6 =5 + 4 =7 +11 =4-0 =4+5 =19-19 =1 +14 =3 +13 =1 + 2 =10-8=95 =16- 3 =18- 4 =7 +11 =17-10 =5+5 =10-3=12+ 5 =10+ 3 =5 - 1 =14+ 0 =1+9 =0 + 8 =6 4- 1 =9 - 5 =4 + 1 =16- 1 =10-5 =10-7 =14-10 =16 6 =13-10 =8 - 7 =9-2 =66=61 =15- 5 =5 + 3 =18- 4 =2+2 =54=18- 2 =19-13 =11+

32、 5 =15-14 =95 =4+3 =19- 1 =16-14 =15- 4 =17-17 =0+5 =3 + 0 =16-14 =2 +12 =11+ 3 =10+ 8 =5 + 3 =9-1 =17-14 =17+ 2 =4 +14 =2 - 1 =2+6=9-0 =1 +14 =16-11 =12-10 =9 - 2 =6+3 =6-3 =2 + 6 =7 + 2 =14-10 =14+ 5 =8+2 =4-2 =19- 5 =6 5 =15- 5 =8 - 7 =2+5 =3+6=15-15 =12- 1 =0 +11 =3 + 4 =7+3 =9-2 =14-12 =15- 2 =

33、11+ 0 =12+ 4 =9-0 =10-5 =1 +15 =0 +11 =0 + 9 =19-10 =0+9 二10-8=1 + 8 =15+ 0 =5 + 0 =2 +12 =7-1 =0+9 =3 + 2 =6 1 =5 + 0 =16+ 3 =6+2 =7+0 =13-12 =1 + 3 =9 + 0 =11+ 8 =8+2 =5-1 =18- 4 =13-11 =9 - 7 =19- 4 =3+4=4-0 =2 + 5 =10+ 5 =3 +11 =4 - 3 =2+5 =10-4=17-12 =12-12 =6 +10 =19- 1 =10-3 =3+5 =4 - 1 =5 -

34、2 =2 + 5 =18-16 =0+7=1+8 =15- 3 =1 +14 =6 +12 =14-13 =8 6 =8-4=18- 6 =1 +10 =15- 5 =15+ 2 =10-5=2+8 二6 +13 =1 +14 =8 + 1 =17- 3 =3+4=9-9 =18- 1 =3 +10 =14+ 4 =3 +16 =8-5 =2 + 3 =12-11 =17-16 =10+ 9 =15-12 =1+3 =7+2 =1 +13 =12+ 2 =10+ 3 =18- 3 =2+4 =65 =3 +12 =16+ 2 =7 - 4 =6 1 =8-4=6+0 =14-10 =11+ 6

35、 =19-16 =1 + 4 =8-4=1+9 二7 4-11 =10+ 6 =2 + 4 =11+ 2 =4+6 =7-3 =3 +12 =17- 5 =19- 3 =16+ 2 =62 =2 + 8 =1 + 4 =18- 3 =1 + 7 =18-17 =7-2 =10-4=14+ 3 =3 +16 =15-12 =6 +12 =4+4 =5-3 =10+ 6 =0 +16 =16- 2 =2 +11 =9-2 =66=2 +15 =2 +12 =16- 2 =0 + 5 =10-3 =8-5=2 4-17 =10-10 =19- 7 =1 + 2 =3+4=95 =4 4-4 =18-

36、 1 =8 - 8 =19- 5 =9-2 =0+5 =14+ 3 =5 + 3 =10+ 7 =11+ 4 =3+0 =6+2 =12+ 7 =10+ 3 =16- 0 =7 +12 =5 + 3 =9-1 =15-14 =14- 2 =9 +10 =4 - 1 =4+5 =2+6=5 - 3 =2 +13 =18+ 0 =1 - 0 =3+0 =2+5 =8 + 0 =1 - 0 =19-19 =2 + 2 =0+3 =8 + 2 =6 - 3 =11- 1 =13-11 =17- 1 =3+6=0+7=16- 2 =14-10 =14-13 =12-11 =7+0 =5 + 2 =11-

37、 0 =13-10 =14- 2 =8 6 =8 + 2 =5-1 =10+ 6 =14- 3 =4 + 3 =17- 1 =9-0 =3+4=15-12 =19-18 =19-18 =16- 1 =9 6 =5+5 =10+ 2 =17- 3 =7 - 3 =17- 6 =4-2 =10-3 =11+ 1 =13-10 =2 +10 =5 + 2 =1+8 =0+6=6 + 2 =12- 2 =17- 6 =9 5 =4+4=7+3 =2 4-13 =13+ 4 =5 + 2 =3 +13 =10-0 =9-2 =1 4-12 =9 - 1 =2 4- 1 =0 + 4 =9-1 =9-3 =18+ 1 =12-12 =15- 2 =3 +10 =8-5=2+2 =1 +14 =19-10 =19-12 =