Answer:

1. 16÷4×5-7+8

* 16÷4=4

* 4×5=20

* 20-7=13

* 13+8=21

2. (80+220)÷10^2

* 80+220 = 300

* 300÷10^2

* 300÷100 = 3

3. 7×{(20÷4)-(10÷2)+10-8}

* 20÷4=5

* 10÷2 = 5

* 7×5=35

* 35-5=30

* 30+10 =40

* 40-8 = 32

Answer:

1. 21

2. 3

3. 14

4. 72

Step-by-step explanation:

1. Solve it Normally

2. (80+220) ÷ 10*2 = (Solve The Parentheses first then, The Exponent) =

300 ÷ 100 =

3. 7x { (20÷4) - (10÷2) + 10 - 8}

Solve the Double Parenthses First

7 x { 5 - 5 + 10 - 8} =

7 x {2} = You can now solve it normally

14

4. [(4+8)*2 ÷ 4] x 2 = Solve the Double Parenthsis

[(144 ÷ 4)] x 2 = Solve the Parenthses

(36) x 2 = Solve it normally

72