Verified answer

1) 3 + 91 + 9 + 97 + 9 = (3 + 97) + (91 + 9) + 9 = 100 + 100 + 9 = 200 + 9 = 209

2) 334 + 41 + 19 + 6 + 50 = (334 + 6) + (41 + 19) + 50 = 340 + 60 + 50 =

= 400 + 50 = 450

3) 58 + 220 + 80 + 42 = (58 + 42) + (220 + 80) = 100 + 300 = 400

4) 41 + 44 + 49 + 46 + 22 = (41 + 49) + (44 + 46) + 22 = 90 + 90 + 22 =

= 180 + (20 + 2) = (180 + 20) + 2 = 202