Bài 2:

a. 571 + 216 + 129 + 124

= ( 571 + 129 ) + ( 216 + 124 )

= 700 + 340

= 1040

Bài 1:

a. Những số chia hết cho 2 là: 320; 4914; 90

b. Những số chia hết cho 5 là: 320; 2315; 90

c. Những số chia hết cho 3 là: 4914; 90; 543

d.  Những số chia hết cho 2;3;5 và 9 là: 90

this is a hand

this is an eraser

no,it's a pencil

it's blue

they're orange

my name is vy

i'm eight years old

i'm happy

it's cooking

yes,i do

1.i'm eight years old

2.my hobby is cooking

3.yes,i do

4.i play with my friends

1.no,i don't

2.i play word puzzles

3. it's blue

4.my hobby is playing badminton

My name school is Nguyen Thi Dinh Secondary School. It live at Gia Dong ward, Thuan Thanh Town. My school has more than 20 class. They are learning, playing, clean thier class... My school is very fun and happy, and I love my school very much

1. My name school is Nguyen Thi Dinh Secondary School

2. It at Gia Dong ward, Thuan Thanh Town

3. My school has 20 class

4. They are learning, playing and clean their class

5. My school is very fun and crowded