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Add and subtract equations
★★★Subtract the same number from both sides and it stays equal.
Ratio Galaxy · Learn first
Example
What is □?
− 11 = 23
Answer: 34
Solve for the box · Patterns & Algebra
Find the box by doing the same to both sides. Finish by writing it as x.
Subtract the same number from both sides and it stays equal.
This is step 1 of unit 7, “Solve for the box”, in Stage 7: Dividing fractions and decimals, ratio and percent, circles and volume (ages 13). A round has 10 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.