x + 7 = 15
→
x = 15 - 7
Sign rule: cross the =, flip the sign
Sign Flip Math
Practice simple equations with one blank. Every number is under 30, and the missing answer is always from 1 to 20.
18 - x = 6
→
-x = 6 - 18
Quick Reminders
Use these every time you solve a problem.
Move
+ 5 across = and it becomes - 5.Move
- 4 across = and it becomes + 4.If the blank starts as
- ( ), flip both sides one more time.Practice Problems
Score: 0 correct out of 0 tries
Only + and -, one blank, and kid-sized numbers.