Skill: two-step-equations
Equation Balance Lab
Build the equation on the scale, then solve it with legal moves only. Touch one side and it tips — do the same to both sides and it stays honest.
Balance scale
2x + 3 = 11
x-block = x
unit block = 1
Left side
2x + 3
Right side
11
Scale
Balanced
Goal: get a single x-block alone on the left pan, then read x off the right pan.
Moves
Add or remove blocks on one side at a time — watch the scale tip. Division always hits both sides.
Step log
Challenges
1. Isolate x on the scale
Hint: remove the units first (−1 on both sides), then split.
2. Solve a fresh equation in 4 logged moves or fewer
Hint: press New equation, then plan: subtract on both sides counts as two logged moves.
3. Predict, then verify
Type the value of x for the current equation, then press Check.