Solve the Expression: 30+6-5+7-17 Step by Step

While that might work sometimes by coincidence, it's mathematically incorrect! The order matters in mixed addition and subtraction. Always follow the left-to-right rule to get reliable results.

Take it one step at a time! Write down each calculation: 30+6=36, then 36-5=31, then 31+7=38, finally 38-17=21. This prevents sign errors.

You can rewrite as $30+6+7-5-17$ and group: $(30+6+7)-(5+17) = 43-22 = 21$. But be very careful with the signs when regrouping!

Use a different method! Try: positive terms (30+6+7=43) minus negative terms (5+17=22) equals 43-22=21. If you get the same answer, you're correct!

When you see only addition and subtraction, work from left to right like reading a book. Don't jump around or try to be clever with grouping unless you're very confident with signs!