# Senior One # Introduction Mathematics is a basic science, which is worth learning by everyone, especially children. Learning mathematics is to build their own thinking system. Learning mathematics means learning a thinking system, and we should also pay attention to this in the process of teaching children every day. The following is the unorganized information about "the mixed calculation problem of addition and subtraction within 20 years in the first grade of primary school", I hope it will help you.

A mixed calculation problem of addition and subtraction within 20 in grade one of primary school

13-4= 13-5= 12-4= 10-4= 14-8=

17-9= 10-6= 10-5= 17-9= 12-7=

14-9= 14-8= 1 1-8= 1 1-2= 1 1-5=

10-7= 15-9= 16-8= 13-5= 1 1-6=

1 1-6= 15-6= 15-9= 2-3= 13-6=

16-7= 13-5= 16-8= 13-9= 10-9=

12-4= 15-7= 10-5= 15-9= 1 1-3=

12-7= 10-9= 10-4= 1 1-7= 13-9=

1 1-5= 10-7= 12-6= 1 1-3= 17-9=

10-8= 10-3= 10-3= 12-8= 15-8=

Add and subtract mixed calculation problems within 20 in grade one of grade two.

17- 10= 16- 1= 16-2= 16-3= 16-4= 1+ 1 1= 1+ 12= 1+ / kloc-0/3= 1+ 14= 1+ 15=

20- 10= 19- 1= 19-2= 19-3= 19-4=

18-5= 18-6= 18-7= 18-8= 18-9=

17-5= 17-6= 17-7= 17-8= 17-9=

6-2= 6-3= 6-4= 6-5= 6-6=

16- 10= 15- 1= 15-2= 15-3= 15-4=

2+7= 2+8= 2+9= 2+ 10= 2+ 1 1=

15- 10= 14- 1= 14-2= 14-3= 14-4=

1+ 16= 1+ 17= 1+ 18= 1+ 19= 2+0=

19-5= 19-6= 19-7= 19-8= 19-9=

2+ 12= 2+ 13= 2+ 14= 2+ 15= 2+ 16=

15-5= 15-6= 15-7= 15-8= 15-9=

18- 10= 17- 1= 17-2= 17-3= 17-4=

2+ 17= 2+ 18= 3+3= 3+4= 3+5=

19- 10= 18- 1= 18-2= 18-3= 18-4=

3+ 16= 3+ 17= 4+4= 4+5= 4+6=

13-5= 13-6= 13-7= 13-8= 13-9=

4+7= 4+8= 4+9= 4+ 10= 4+ 1 1=

13- 10= 12- 1= 12-2= 12-4= 12-5=

4+ 12= 4+ 13= 4+ 14= 4+ 15= 4+ 16=

Add and subtract mixed calculation problems within 20 in grade three and grade one of primary school.

( 1)9-3= (2)9-3= (3)8- 1= (4) 17-6= (5) 1 1-7= (6) 14+0= (7) 17-3= (8)9- 1= (9)6-5= ( 10)7+ 1 1=

( 1 1) 17-9= ( 12)6+ 12= ( 13)9-0= ( 14) 15+ 1= ( 15)8+7=

( 16)3-3= ( 17)6-4= ( 18)0+ 1= ( 19) 19-9= (20)7-4=

(2 1)0+ 14= (22) 1 1-2= (23) 13-2= (24) 1 1-7= (25)8+ 1=

(26)8+8= (27)7-0= (28) 1+ 1= (29)3-3= (30) 12-5=

(3 1)8+9= (32) 13-9= (33)9+ 10= (34) 17-3= (35) 15-8=

(36) 16-9= (37)5+8= (38) 13+6= (39)4-3= (40)3- 1=

(4 1) 1 1+6= (42) 1 1-0= (43)3+8= (44) 1 1+9= (45)8+ 12=

(46)9-7= (47)4+7= (48)7-3= (49) 13- 1= (50)9+4=

(5 1)9+ 1 1= (52) 1+7= (53)9- 1= (54) 10+8= (55) 1+0=

(56) 10- 1= (57) 15-8= (58)2+8= (59)7+7= (60)5+8=

(6 1) 1+ 15= (62)6+9= (63) 15-6= (64) 13-2= (65) 17-6=

(66)8+6= (67)2+8= (68) 10-5= (69)4-4= (70)9-7=

(7 1)0+ 16= (72)7+6= (73) 18-3= (74)5-3= (75)8+ 10=

(76)5+3= (77) 19-5= (78)9-0= (79) 1 1+7= (80)2-0=

(8 1) 1+0= (82) 13-8= (83)9+6= (84)0+0= (85)8+9=

(86)5+ 1= (87)6+ 1= (88)4-4= (89)8+2= (90)2+5=

(9 1)7- 1= (92) 15-8= (93)2+0= (94)2+6= (95)2+5=