1-mavzu: 100 ichida qo’shish bajarish Sonlarni qo’shishning qulay usullarini qarabh o’tamiz

1-MAVZU: 100 ichida qo’shish bajarish
Sonlarni qo’shishning qulay usullarini qarabh o’tamiz.
Masalan 26+7=26+4+3=30+3=33 biz sonlarning 10ga to’ldiruvchisini topishimiz kerak.
Masalan, 1+9=10, 2+8=10, 3+7=10, 4+6=10, 5+5=10
Demak 47+8 ni 47+(3+5) deb olamiz bu yerda 47+3=50, 50+5=55

Shundan foydalanib, 84+9=84+6+3=90+3=93

78+17=78+2+15=80+15=95
37+16=37+3+13=40+13=53
77+19=77+3+16=80+16=96
39+42=39+1+41=40+41=81
56+28=56+4+24=60+24=84
44+37=44+6+31=50+31=81

Mustaqil ishlash uchun misollar:

1. 
   56+37 7) 23+29
   
2. 
   42+39 8) 33+38
   
3. 
   73+18 9) 43+19
   
4. 
   27+17 10) 55+16
   
5. 
   48+18 11) 68+28
   
6. 
   53+29 12) 37+47
   

2-Mavzu: Sonlarni ayirishni qulay usulda o’rganamiz

Masalan bizga 78-19 ayirmani hisoblash berilgan bo’lsin, uni
78-19=78-18-1 deb yozib olamiz
Undan 60-1=59 hosil bo’ladi
Endi misollarni qarab o’tamiz:
48-27=1+47-27=1+20=21
44-19=44-14-5=30-5=25
53-34=53-33-1=20-1=19
91-19=91-11-8=80-8=72
56-18=56-16-2=40-2=38
49-18=1+48-18=1+30=31
72-16=72-12-4=60-4=56

Mustaqil ishlash uchun mashqlar:

1. 
   54-16 8. 88-29
   
2. 
   65-17 9. 77-38
   
3. 
   82-19 10. 43-21
   
4. 
   93-28 11. 37-13
   
5. 
   44-27 12. 39-14
   
6. 
   83-48 13. 43-16
   
7. 
   71-54 14. 51-37
   

3- mavzu: Sonlarni qo’shishning qulay usullari

Biz 1+9=10 ekanini bilamiz va 2+8=10, 3+7=10, 4+6=10, 5+5=10 ni ham.
Agar bizga 1+8+9 berilgan bo’lsa,
(1+9)+8 deb yozib olsak bo’ladi undan 10+8=18 chiqadi
2+16+8=(2+8)+16=10+16=26
3+24+7=(3+7)+24=10+24=34
5+13+7=5+(13+7)=5+20=25
26+8+4=(26+4)+8=30+8=38
27+6+3=(27+3)+6=30+6=36
48+54+6=48+(54+6)=48+60=108
Mustaqil ishlash uchun mashqlar:

7+21+3 53+12+7

6+35+5 53+12+8
44+21+6 53+17+9
51+13+9 55+17+5
16+21+9 35+37+3
56+19+4 34+35+6
18+22+4 35+34+5
58+18+2 47+14+3
15+14+5 19+26+1
21+22+8 23+24+6
23+24+7 45+22+5
45+22+8 26+25+4
28+29+2 28+29+1
36+37+4 36+37+3
71+13+9 71+13+7
19+17+1 19+17+3