i will help you ok .778=7178=(71)(87)=(7)(8)(1)(7)=567=8
7(78)=(71)(78)=(7)(7)(1)(8)=498(Decimal: 6.125)
7−78=71−78=71+−78=568+−78=56+−78=498(Decimal: 6.125)
7+78=71+78=568+78=56+78=638(Decimal: 7.875)
i have adding subtracting , dividing , and multiplying there all your anwser i hope this helpxx
