I think they should keep it around, even if it might not be the most efficient strategy. After all, what if you need to solve a problem using multiple strategies?
Answer:
98.42
Step-by-step explanation:
7 × 14.6 =
= 7 × (7 + 7 + 0.6)
= 7 × 7 + 7 × 7 + 7 × 0.6
= 49 + 49 = 0.42
= 98.42
6.39 divided by 0.3= 21.3