Maths 3_Week 20_Expression_Lesson 1+2

what is math expression?

• 2024 -

• apple

• 276 - 21

• 25 x

Work from left to​ (a)   when there are only ​ (b)   and subtraction.

• right
• addition
• up
• down
• multiplication

Each dog has 4 legs. How many legs do 5 grey dog and 7 black dog have?

Tìm các cặp tương ứng sau

• 2

• (150 + 250) x 2

• 369

• 100 + 3 x 20

• 800

• 324 - 53 + 98

• 160

• 200 : (75+25)

When performing calculations, we calculate in order?

• brackets

• multiplications / divisions

• addition / subtraction

• left to right

250 x 4 + ( 343 - 43 ) : 2

Alex had 6 boxes of crayons. Alex gave Lucy 2 boxes. Each box has 10 crayons.

How many crayons does Alex have left?

30 sec audio

Calculate, compare and put the correct sign “> ; < or =”

• =

• 15 x 3 : 45 ....... 23

• <

• 50 - 600 : 30 ....... 10

• <

• 41 + 295 : 5 ....... 101

• >

• 100 : 4 : 5 ....... 5

Connect the correct answers.

Groups:

(a) brackets

,

(b) multiplications / divisions

,

(c) addition / subtraction

• 
• 
• 

23 + 54 x (100 - 98) - 25 : 5

• 162

• 126

• 136

• 116