Question

Compute by suitable grouping 42+11+58+19

Answer 1

(50 - 8) + (10 + 1) + (50 + 8) + (20-1)
= [ (50 - 8) + (50 + 8)] + [(20-1) + (10 + 1)]
= (50 - 8 + 50 + 8) + (20 - 1 + 10 + 1)
= (100) + (30)
= 100 + 30
= 130

Answer 2

Answer:

answer is 130 of grouping