20以内加减法口算练习试题20套

1、20以内加减法口算练习题（一）姓名:时寸间:做对:10 + 8 =10 + 2 =13 + 2 =8 + 2 + 3 =8+ 10 =17 - 7 =19 - 3 =9 + 1 + 4 =18 - 8 =10 + 8 =3 + 11 =7 + 3 + 5 =18 - 10 =3 + 10 =16 - 4 =7 + 4 + 6 =10 + 1 =10 + 2 =19 - 4 =7 + 8 + 3 =1+ 10 =10 + 10 =19 - 5 =6 + 4 + 7 =11 - 1 =14 - 4 =15 - 3 =8 + 2 + 5 =11 - 10 =18 - 8 =10 + 4 =5 + 4

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

3、8 - 10 =20 - 20 =17- 10-7 =10 + 8 =10 - 10 =12 + 4 =14- 10 + 5 =3+ 10 =10 + 9 =8 8 =16- 10 + 3 =11 - 1 =10 - 5 =10 + 0 =20 - 10-7 =20以内加减法练习题（二）姓名：时间：做对了题9+ 1 =8 + 7 =8 + 4 =9 + 7 =9 + 7 =8+ 2 =7 + 9 =8 + 5 =6 + 6 =6 + 5 =83=75=96=49=28=29=86=68=65=77=199=88=79=58=8 8 =93=74=810=57=48=84=85=74=87=8

4、6 =59=77=57=48=76=86=65=928 639=49=19=78710=5=9=59=73=98=2 838=69=6 7 92=109=64=79=56=83=210=72=8 9=85=67=986 9=90=107=846 368=58=67=19=10 4510=89=2 9 10 5=68=133=99=94=95=93=3 8 =93=59=8274=67=3+ 8 =9+ 5 =93=83=54=20 以内加减法练习题（三）姓名： _时间： _做对了 题89=98767 5=108=85=96=69=55=957895=46 5 9=6 77 7=9 4=8+4=

5、97=9 4=74=658 67 8=84=6668=96=102=7+78+5 =83=29=97=58=74=75=8 8=84=99=182=92=48=8 4=105=57=9 476=9 6=95=76=9 4=84=79=67=68=94=810=75=796 + 2+ 7 =4 + 5+ 2 =357=446=432=465 =724=265=717=6 34=6 15=524=359=641=365=8+ 7 =61057 98=726=92 8 6 =47 9 3=449=75=19774 84=919=79=73=93=83822=85=28=66=66731=20 以内加

6、减法练习题（四）姓名： 时间： 做对了 _ 题824=826=369=458=732=442=265=234=826=627=725=638=734=637=927=332=918=547=828=224=825=458=947=487=549=107=827=10 2 7=522=961=947=12 6 5=364=546=629=775=527=517=823=827=736=239=946=837=727=726=435=523=423=915=623=622=634=732=396=331=4+ 2 + 5 =1084=1054=235=7+ 2 + 7 =729=346=307=8

7、12=627=964=555=185=827=458=734=639=639=757=626=1012=517=1040=876=认数基本题（一）姓名： 时间： 做对了 题1 个十和 6 个一合起来是（ ）1 个十和 7 个一合起来是（）1 个十和 2 个一合起来是 （ ）9 个一和 1 个十合起来是（）14 里有（）个十和（ ）个一（ ）个十和（ ）个一合起来是 132 个十是（）20 里面有（）个一18 里有（）个十和（ ）个一1 个一和 1 个十合起来是（）6 个一和（）个十合起来是 16（ ）个一和 1 个十合起来是13比 14 大，比17 小的数有（）18 接近 10 还是 20(

8、)个位上是 7，十位上是 1，这个数是（）十位上是 2，个位上是 0，这个数是（）个位上是 1，十位上是 5，这个数是（）一个数比 16 大，比 19 小，这个数可能是（ ）、按规律填数：0、 2、（ ）、（ ）、（）、 10、（ ）、（）、（）、（）、（）19、（）、 15、（）、（）、 9 、（）、（）、（）、（）5、 10、15、（）、（3+8=11-5=16-8=6+5=13-5=3+9=9+9=18-9=15-4=5+7=7+7=11-2=15-7=12-6=4+8=14-8=9+6=12+3=5+8=2+9=16-8=6+10=15-3=6+7=3+9=15-6=14-9=16-7

9、=5+6=19-9=20以内的加减法 （一）1、4、7、9+2=12-4=4+7=17-7=11-3=6+8=11-4=15-8=9+8=8+7=姓名13-7=20以内的加减法（二）姓名14-9=9+5=12-8=15-7=8+9=15-9=10+6=7+8=8+3=7+5=17-8=9+4=13-9=7+6=12-9=9+6=8+5=16-8=7+4=8+6=10+5=9+9=14-7=18-8=14-9=18-9=8+8=3+9=11-7=14-2=6+7=11-3=5+6=15-8=6+6=11-2=16-9=4+8=16-8=20以内的加减法（三）姓名一15-7=13-7=12-8=7

10、+4=16-7=15-8=13-9=11-7=8+5=10+3=9+3=14-7=7+8=13-8=9+5=16-9=9+4=5+8=17-8=9+6=8+6=14-8=17-7=12-3=15-8=13-4=18-4=12+3=16-8=6+6=15-9=7+5=6+5=12-4=6+7=16-8=15-6=12-6=14-5=18-9=20以内的加减法（四）姓名9+3=12-5=4+9=6+7=3+8=17-7=12-10=7+6=10+6=16-7=9+6=8+5=8+7=4+13=11-1 =13-4=11-2=12-7=17-9=6+6=5+6=9+8=15-9=7+7=6+8=13

11、+6=8+4=16-2=8+8=7+9=10+2=11-6=6+5=4+7=13-8=11-9=14-6=3+9=12-8=15-7=20以内的加减法（五）姓名18 - 5 =17 - 11 =13 + 6 =17 - 5 =16 - 10 =5 - 4 =9-4 =16 - 1 =7+ 10 =9 - 0=18 + 1 =6 + 10 =4 - 0=18 - 12 =17 - 17 =10 + 2 =10 - 10 =9 - 0 =15 - 7=4 + 1=0+ 16 =2 + 2 =13 - 12 =4 + 12 =13 + 4 =6 5 =15 - 13 =14 + 1 =3+ 12 =

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

13、 6 =19 5=7 3 =12 + 4=10 + 7 =1 + 12 =11 + 1 =17 10 =9 9 =4 + 12 =11 + 2 =13 + 2=16 1 =19 13 =4 3=1 + 14 =15 3=6 5=13 + 1=11 + 1 =19 1=2 + 6=19 18=2 + 11 =2 + 6=18 13=12 + 7=3+ 1 =3 + 4一16 14一18 2一5 + 4=2 - 2 =13 - 3 =18 - 11 =6 3 =7 1 =11 10 =0 + 11 =17 13 =17 3=8 + 0=5 3=14 2=17 14 =（六）6 0 =0 + 18

14、=2 2 =5 + 14 =6 1 =5 + 10 =5 5=3 + 11 =9 5=13 10 =7 3 =0 + 4=3 + 12 =20以内的加减法7 3 =8 6 =17 + 0 =13 + 1 =0 + 10 =11 + 3=5 + 10 =2 + 2 =1 0 =17 1=9 8=5 3=16 14 =姓名7 + 11 =10 + 3 =1 + 7 =11 + 0 =2 + 6 =12 10 =19 11 =10 + 3 =19 8 =17 + 0 =2 2 =9 8=3 0=1 + 3 =5 - 2 =14 + 5 =10 + 8 =1 + 8 =17 - 11 =15 - 11

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

16、 + 4=17 - 10 =2 + 14 =20以内的加减法10 + 1 =3 + 3 =1 + 8 =18 - 7=12 + 3=18 - 16 =13 - 1=0+ 19 =2+ 11 =1 + 5=19 - 17 =1 + 15 =5+ 13 =（七）2 + 15 =18 - 4 =1 + 13 =0 + 19 =18 - 13 =18 - 6 =19 - 15 =9 - 2 =7 - 3 =15 + 3 =3 + 6=7 - 6=15 + 1=姓名19 - 5 =19 - 10 =14 - 4 =12 + 1 =6 - 0 =9 - 1 =8 0 =3 3 =13 - 2 =18 -

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

18、+ 1 =4 - 3=3 + 1=4 - 2=1 + 7=13 - 1=15 - 3=7 - 1=12 + 2 =1 + 10 =7+ 10 =15 - 10 =18 - 6 =1 + 7=3-2 =18 - 3 =1 + 18 =13 - 0 =15 - 0 =17 + 0 =16 - 4 =2 - 2 =19 - 4 =11 + 2 =3 + 15 =20以内的加减法（八）0 + 9 =4 + 10 =0 + 11 =4 - 3 =17 + 2 =1 + 7 =18 - 8=11 - 10 =15 - 12 =4 + 3=8 4=0+ 5 =16 + 1 =10 + 8 =3 0=12 -

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

20、 5 =2 + 6 =1 + 2 =14 + 3 =11 + 8 =1 + 1 =17 - 16 =1 + 2 =5 + 14 =12 + 4=18 - 17 =12 + 3=17 - 15 =6 - 1 =6 5=6 + 2 =16 + 3 =1 + 14 =16 + 1 =4 + 15 =2+ 3 =18 - 13 =7 - 1=15 - 1=17 - 6=3 + 15 =1 + 2 =12 + 3=16 - 1 =5 + 12 =15 - 11 =19 - 18 =11 + 6 =11 + 2 =20以内的加减法（九）姓名19 + 0 =1 + 18 =7 - 1 =1 + 16 =4

21、+ 2 =16 - 15 =1 - 1 =17 - 16 =7 + 1 =5-2 =2 + 4 =19 - 17 =10 + 10 =6- 1 =1 + 0 =1 + 11 =2 + 10 =0 + 4 =18 - 15 =12 - 1 =15 - 13 =5 + 14 =3 + 0 =1 + 15 =6 - 0 =8 0 =12 + 7=15 - 11 =13 + 4=0+ 0 =19 - 8=13 + 5 =18 - 6 =18 - 4=1 + 16 =1 + 13 =9 - 0=8 0 =9 - 2=2 + 10 =14 - 2=18 - 6 =19 - 14 =12 - 2 =0 +

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

23、 - 14 =17 + 2=4 + 14 =13 - 3 =1 + 14 =16 - 11 =12 - 10 =19 - 8 =2 + 6 =7 + 2=14 - 10 =9 - 6=19 - 5=6 5=15 - 5=4 + 12 =20以内加减法练习（六）姓名：时间：成绩：10 + 6 =0 + 16 =16 - 2 =19 - 1 =2 + 15 =2 + 12 =16 - 2 =18 - 16 =2 + 17 =10 - 10 =19 - 7=14 - 13 =15 - 15 =12 - 1 =0 + 11 =7 + 11 =14 - 12 =15 - 2 =11 + 0 =1 + 2

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

25、=14 + 3=1 + 14 =1 + 10 =1 + 14 =3 + 10 =17 - 16 =12 + 2 =16 + 2 =6 + 12 =15 - 5 =8+ 1 =14 + 4 =10 + 9 =10 + 3 =7 - 4=2- 1 =9-2 =14 + 5 =8-7 =3 + 4 =12 + 4 =19 - 10 =11 + 6=19 - 16 =2 + 12 =10 +6=2 + 4=16 + 3 =17 -5=19 - 3=11 + 8 =18 -3一1 + 7=19 - 4=3 + 16 =15 - 12 =4 - 3=20以内加减法练习（七）姓名：时间：成绩：4 + 4 =

26、14 + 3 =12 + 7 =15 - 14 =5 3 =8 + 0 =6 3=16 - 2 =11 - 0 =10 + 6 =15 - 12 =18 - 1 =5 + 3 =10 + 3 =14 - 2=2 + 13 =1 - 0 =11 - 1 =14 - 10 =13 - 10 =14 - 3=19 - 18 =8 8 =10 + 7 =16 - 0 =9 + 10 =18 + 0 =19 - 19 =13 - 11 =14 - 13 =14 - 2=4 + 3=19 - 18 =15 + 2 =17 - 3 =3 + 16 =15 - 12 =18 - 3 =6- 1 =I + 4=

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

28、+ 5 =1 + 2 =19 5 =11 + 4=7 + 12 =4 1 =1 0 =2 + 2 =17 1=12 11 =8 6 =17 1=16 1 =20以内加减法练习（八）姓名：时间：成绩:17 5 =0 + 18 =18 14 =17 6 =8 7 =13 + 0 =2 + 2 =5 + 2 =8 + 0 =3 + 6 =4 + 12 =9 5 =6 1 =2 + 3 =17 + 2 =3 + 13 =5 0 =3 0 =11 + 5 =0 + 4 =9 + 10 =14 11 =8 + 0 =3 + 10 =11 + 7=16 0 =5 + 3 =0 + 11 =1 + 8 =12

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

30、5 =16 + 2 =2 1=10 + 3 =3 + 11 =11 10 =1 + 7=6 + 3=2 + 12 =11 10 =1 + 12 =7 + 10 =12 + 2 =16 11 =7 7=5 + 12 =2 + 16 =7 3 =14 1=11 + 2 =5 3=16 3=12 + 1=9 5 =20以内加减法练习（九）姓名：时间：成绩：-18 11 =10 + 7=15 12=1 + 16 =1 + 16 =5 5 =3 + 3=10 + 6 =18 12 =7 7 =4 1=12 1 =0 + 1 =7 0 =1 + 10 =15 5 =2 + 3=19 9 =17 4=11

31、+ 2 =4 4=16 + 1 =6 2=16 1 =16 + 3=5 5=18 + 0=7 + 11 =5 + 12 =13 2=2 + 6=8 4=16 + 3=1 + 13 =4 07 2=9 + 0 =13 + 3 =17 - 4 =10 + 4 =11 + 3=10 + 10 =5 - 4 =17 - 3 =15 + 3=17 - 16 =3 + 3 =2 + 6 =15 + 1 =14 + 3=12 + 3=16 - 6 =4 - 0 =0 + 16 =8 - 2 =19 - 5 =16 - 14 =7 - 5 =17 - 4 =1 + 4 =15 - 4=5 + 1 =18 -

32、8=7 - 3=14 + 1=10 + 6=16 - 0 =3 + 2 =0+ 6 =3 + 11 =2 + 11 =9-4 =5 + 4 =14 - 2=19 - 17 =15 - 12 =19 - 5=2 + 16 =5 - 2=13 - 2=3 + 15 =2 + 4 =16 - 12 =19 + 0 =2 + 6 =11 + 3 =4+ 3 =5 3 =2 + 1 =7 + 2=14 - 12 =18 - 16 =8 5=16 - 13 =3 + 14 =13 - 2=20以内加减法练习（十）姓名：时间：成绩:1 + 16 =14 + 2 =1 + 14 =3 + 14 =7 - 5

33、=7 - 1 =10 - 0 =15 + 1 =5 + 10 =2 + 5 =11 + 6 =8 8 =11 + 7=9 - 6 =10 + 6 =1 + 0 =7 - 1=17 + 0=19 - 2=15 - 10 =8 - 2 =11 + 0 =5 + 2=4 + 10 =2 + 4=2 + 3 =12 + 3=15 - 14 =1 + 16 =16 - 3=18 - 10 =17 - 4=15 - 4=15 + 2 =16 - 14 =8 + 10 =15 - 10=15 - 2=3 3=0 + 19 =15 - 2=2 + 10 =5 + 14 =8 4=15 - 4=7 - 3 =2

34、 + 10 =7 + 11 =11 - 10=14 + 2=12 + 0 =4 + 3=19 - 19=4 + 15=13 - 0=12 - 12 =5 + 10 =1 + 1 =19 - 3 =15 - 2 =9 - 2=17 - 3=8 6 =10 + 1 =18 - 5=1 + 10 =19 - 18 =8-2 =2 + 2=8 - 7 =11 + 1 =16 + 3 =4 + 10 =19 - 9 =3+ 0 =19 - 5 =12 - 1=17 - 3=3 + 1=17 - 12 =17 - 16=12 - 11 =3 + 10 =5 - 1=9 - 3=10 + 9=19 - 6

35、=2 + 10 =17 - 2=4 + 15 =3 + 2 =1 + 1 =17 - 14=7 - 6 =16 - 5 =3 + 10 =13 + 6一1 + 2 =6-2 =18 - 1 =20以内加减法练习（十一）姓名：时间：成绩:0 + 11 =5 + 14 =0 + 7 =0+ 6 =19 - 16 =0 + 0 =18 - 13 =18 - 1 =0 + 11 =1 + 17 =0 + 2 =13 - 10 =0 + 3=1 + 15 =9 - 9=10 - 10 =3 + 12 =16 - 0 =0 + 0 =17 - 3=19 - 6=2 + 13 =1 + 10 =2 + 13

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

37、 1 =10 + 9 =12 - 10 =11 + 3 =17 - 1 =14 - 10 =2 + 2 =2 + 11 =18 - 6 =12 - 1 =13 - 11 =1 + 18 =7 - 6=7 - 1=19 - 18 =18 - 3=19 - 5 =6 + 11 =6 5 =7 + 2 =17 - 15 =3+ 5 =3+ 1 =7+ 1 =17 - 2 =4+ 3 =2 + 16 =2 + 14 =17 - 10 =1 + 7=7 + 1=7 - 6=10 + 9 =20以内加减法练习（十二）姓名：时间：成绩：一14 + 4 =0 + 3 =17 - 11 =18 - 1218 -

38、 5 =14 + 4 =0 + 12 =3 + 11 =7+ 10 =7 + 0=2 + 6 =5 + 12 =5+ 12 =18 - 3=19 - 3=7 - 4 =2 + 4=7 - 1=18 - 12 =2 + 17 =9 8 =10 + 1 =7 - 5=7 + 11 =12 + 3 =1 + 14 =17 14 =1 + 15 =1 + 1 =9 5=6+ 1 =0 + 17 =6 + 11 =0 + 17 =6 1 =16 5 =13 2 =6 + 12 =15 14 =7+ 0 =12 + 7=2 + 10 =5 + 11 =6+ 0 =13 10 =16 13 =5 + 2=1

39、6 14 =5 + 13 =2 + 10 =12 + 3=3+ 1 =19 1=4 4=0 + 18 =12 + 5 =2 + 13 =2 + 15 =19 13 =18 + 0 =4 + 13 =9 0=6 5 =15 4 =10 + 2 =6 + 13 =3 + 6 =12 + 1 =1 + 18 =18 11 =1 + 8 =4 + 4 =12 + 4 =0 + 16 =8 2 =3 + 10 =2 + 1 =6 6 =3 + 13 =6 3=4 + 13 =5 + 1=7 5 =19 19 =13 + 2=16 14 =16 + 3 =13 13 =6 2 =4 + 12 =10 + 0 =6 2 =4 1=16 1