Minglik va ko`p xonali sonlar konsentrida arifmetik amallar bajarishni o`rgatish metodikasi. Hisoblashning og`zaki va yozma usullari

Minglik mavzusida oldin qo`shish va ayirishning og`zaki, keyin esa yozma usullari o`rganiladi.

250 30, 420 300 ko`rinishidagi og`zaki qo`shish va ayirish hollari.

250+30=(200+50)+30=200+(50+30)=200+80=280 yig`indiga sonni qo`shish.

250-30=(200+50)-30=200+(50-30)=200+20=220 yig`indidan sonni ayirish.

420+300=(400+20)+300=(400+300)+20=700+20=720 yig`indiga sonni qo`shish.

420-300=(400+20)-300=(400-300)+20=100+20=120 yig`indidan sonni ayirish.

Qo`shishning yozma usuli ustun shaklida amalga oshiriladi. Yozma qo`shish yuzliklardan emas balki birlikdan boshlanishiga bolalarning e’tiborini qaratish kerak.

412 279 346 563 437 563

+325 +721 +454+246 +123 -321

737 1000 800 809 560 242

Amaliy topshiriqlar:

1.1000 lik konsetrida sondan yig`indini ayirishga doir 5 ta misol keltirib bajarilishini ko`rsatib bering.

2. 1000 lik konsetrida songa yig`indini qo`shishga doir 5 ta misol keltirib bajarilishini ko`rsatib bering.

3. 1000 lik konsetrida yig`indidan sonni ayirishga doir 5 ta misol keltirib bajarilishini ko`rsatib bering.

4. 1000 lik konsetrida yig`indiga sonni qo`shishga doir 5 ta misol keltirib bajarilishini ko`rsatib bering.

5.Minglik mavzusida ismli sonlar ustida amallar bajarish.

1.Amallarni bajaring:

5 m 32 sm — 8 dm 7 sm;3 m 15 sm — 7 dm 8 sm; 36 dm 2 sm + 4 m 8 sm;

6 m 2 dm 1 sm + 29 sm; 8 m 5 dm 4 sm + 18 sm; 6 m 4 dm - lm 8 dm 5 sm.

2. 15340 sm ni detsimetr, metr va santimetrda ifodalang.

3. Amallarni bajaring:

a) 7 m 3 dm 8 sm — 3 m 4 dm 6 sm =b) 5 m 23 sm + 1 m 6 dm =

d) 4 m 7 sm — 2 m 6 dm 9 sm =e) 8 m 5 sm — 9 dm 6 sm =

4. 164200 grammni kilogramm va sentnerda ifodalang:

5. Qulay usulda hisoblang:

(834 + 98) - 234 592 + (294 + 108)

781 - (56 + 681) 75 + 139 + 25 + 61

6.48 m matodan 8 ta bir xil kostyum, 28 m matodan esa 7 ta bir xil shim tikildi. Kostyumga nisbatan shimga qancha kam mato ketadi.

7.G'ofur va Bahodirda jami 2700 so'm bor. Agar G'ofurda Bahodirga nisbatan 300 so'm kam pul borligi ma'lum bo'lsa, ularning har birida necha so'm bo'lgan?

Darslik bilan ishlash: 1-sinf darsligidan 31-40-mavzularni o`rgatilishini tahlil qilish.

Boshqotirmalar bilan ishlash.