Question

15•10+(30–20)•5=? 15•10+30–20•5=? (120+320:4)•2=? (120+320):(4•2)=?

Answer 1

1) 15·10+(30-20)·5=150+(10·5)=150+50=200
2) 15·10+30-20·5=150+30-100=80
3) (120+320:4)·2=(120+80)·2=200·2=400
4) (120+320):(4·2)=440:8=55

Answer 2

15*10+(30-20)•5= 150+10•5=200 15•10+30-20•5= 150+30-100= 80 120-+320:4)•2=(120+80)•2=400. 120+320):(4•2)=440:8=55

Answer 3

Let's calculate each expression step by step:

1. 15 × 10 + (30 – 20) × 5

First, we calculate the subtraction inside the parentheses:

30 – 20 = 10

Then, we perform the multiplication and addition:

15 × 10 + 10 × 5 = 150 + 50 = 200

Therefore, the result is 200.

2. 15 × 10 + 30 – 20 × 5

Following the order of operations (PEMDAS/BODMAS), we perform the multiplication before addition and subtraction:

15 × 10 = 150

20 × 5 = 100

Then, we perform the addition and subtraction:

150 + 30 – 100 = 180 – 100 = 80

Therefore, the result is 80.

3. (120 + 320 ÷ 4) × 2

First, we perform the division inside the parentheses:

320 ÷ 4 = 80

Then, we perform the addition:

120 + 80 = 200

Finally, we perform the multiplication:

200 × 2 = 400

Therefore, the result is 400.

4. (120 + 320) ÷ (4 × 2)

First, we perform the addition inside the parentheses:

120 + 320 = 440

Then, we perform the multiplication:

4 × 2 = 8

Finally, we perform the division:

440 ÷ 8 = 55

Therefore, the result is 55.