Answer:

1.

N= 900 - 155

N= 145

2.

-N= 450 - 650

-N= -200

N= 200

3.

N= 300 ÷ 5

N= 60

4.

N= 56 × 20

N= 1 120

5.

N= 3 098 + 1 500

N= 4 598

Correct me if one of my answers is wrong po. I hope this helps and please make this answer brainliest if it helped po. Thanks!