1-mashg’ulot Mavzu: Cho‘tlar. Uch xonali sonlarni cho‘tga solish. 320+430, 860-250 ko‘rinishdagi misollarni yechish

3. Yangi mavzu bayoni.

540. Yechishni tushuntiring:

1) 40•70 = 2) 800•500 =

= 4 o'nl. • (7 • 10) = =8 yuzl. • (5 • 100) =

= (4 o'nl. • 7) • 10 = = (8 yuzl. • 5) • 100 =

= 28 o'nl. • 10 = =40 yuzl. • 100 =

= 280 o'nl. = 2 800 = 4 000 yuzl. = 400 000

Nol bilan tugaydigan ko'p xonali sonlar quyidagicha ko'paytiriladi:

IV. Mustahkamlash.

541. Tushuntirish bilan yeching:

4 800 • 40=192000 1 840 •30=55200 2 040 • 400=816000

542. Og'zaki hisoblang, faqat javobni yozing:

400 • 30=12000 250 • 200=50000 400 • 600=240000 7 000 • 40=280000

90•200=18000 60•900=54000 300•700=210000 50•2 000=100000

543. Qayerda sharbat ko'p - 3 ta 5 l li bankadami yoki 4 ta 3 l li bankadami? Necha litr ko'p?

544. Kinoteatr katta zalining har birida 28 o'rindiqdan 30 qator, kichik zalining har birida 18 o'rindiqdan 20 qator bor. Kinoteatrning ikkala zalida hammasi bo'lib nechta o'rindiq bor?

545. 6 845 + 34 • (91 - 89)=6913 10 332 : 4 + 36 846 : 9=2583+4094=6677

V. Uyga vazifa 546-547-misol, masalalar

546. Tenglamalarni yeching:

760 - x = 312 x : 10 = 230

x•10 = 450 670 : x = 670

547. Yeching va natijani tekshiring:

56 792 + 42 009=98801 80 014 - 72 935=7079