Instead of adding 6 three times, you can multiply 6 by 3 and get 18, the same answer.
Similarly,
6 + 6 + 6 + 6 + 6 + 6 + 6 = 6 × 7 = 42
Answer:
a2 (10x10) + b2 (4x4) = c2 (100+16)
Answer: √116
3:5.....added = 8
3/8(40) = 120/8 = 15 m <== one piece
5/8(40) = 200/8 = 25 m <== the other piece
Exact Form: -245/12 , Decimal Form: -20.4166666, or Mixed Number Form: -20 5/12