Solve 247÷10*2 and247×10*2

247/10*2=49.4.
247*10*2=4,940. 
Order of operations does not apply to these problems, because division and multiplication are interchangeable. Just divide 247 and 10, then multiply the quotient by 2 to get 49.4. For the other equation, multiply 247 by 10, then multiply the product by 2 to get 4,940.
Hope this answered your question.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)

B. 2 1/2 feet. multiply 2.5 inches by 12 to get thirty inches then divide by 12 to get 2.5 feet