Live demo problems
Click any problem to open the student view. Construct your solution by clicking, dragging, or typing problem values and operators — Grade-It evaluates each step, awards partial credit, and explains its scoring.
How to solve
Click, drag, or type a problem value or operator to add it to the active step. As soon as a step contains a valid expression the result is calculated. Add as many steps as you need; the result of one step can flow into the next. Click or drag the final answer into the answer box and click Submit for an instant grader report. Use the report to refine your work and resubmit. After three submissions a Show Solution button appears — some problems include multiple valid strategies.
Total cost of apples purchased
- Single strategy
Height of a similar right triangle
- Multiple strategies
Height & base angle of a similar right triangle
- Multiple strategies
- Multiple answers
Moles for a molecular formula given mass
- Multiple strategies
- Drop-down table
Solubility-product constant computation
- Multiple strategies
Gross pay (overtime) and net pay after deductions
- Multiple strategies
- Multiple parts
- Full credit for B if A wrong
Gross pay & net pay (strict variant)
- Multiple strategies
- Multiple parts
- No credit for B if A wrong
Cost savings with alternate purchase options
- Single strategy
Basic probability
- Single strategy